Switch installations vary by vehicle type, year, and tuner. This guide covers the switches we use, as well as other common brands such as MotorOps and Calibrated Power.
It is suggested for all switch installs to disconnect the battery first.
1. Prepare the switch
Unscrew the retaining nut and remove the lock washer to expose the tabbed washer.
The tabbed washer limits how far the switch can rotate and determines how many tune positions are available. To change the number of available positions, turn the switch fully counter-clockwise, then reposition the tabbed washer so its pin sits in the appropriate hole.
Power levels increase as the switch is turned clockwise. Refer to your original tune order for the number of available positions and their power-level arrangement.
Note: Higher power levels may be intentionally locked out if desired. For example, a work vehicle may only require lower-power towing and daily-driving settings while still benefiting from selectable tuning.
2. Choose and drill the switch mounting location
Choose a suitable mounting location inside the cab where the switch can be easily reached and will not interfere with factory controls, wiring, or components behind the panel. Button blanks and dash panels are common mounting locations, but other suitable locations may also be used.
Use the supplied drilling template to mark and drill the two required holes:
- 3/8" hole for the switch shaft
- 1/8" hole for the locating tab
Be sure to drill the 1/8" locating hole and seat the locating tab before tightening the retaining nut. Failure to properly install the locating tab may place unnecessary stress on the switch assembly and could result in damage.
3. Mount the switch
Insert the switch through the panel with the locating tab positioned in the 1/8" hole.
From the front of the panel, install:
- Power level indicator
- Lock washer
- Retaining nut
Tighten the retaining nut securely while keeping the switch and indicator aligned. Install the knob once the switch is secured.
4. Route the switch wiring through the firewall
Locate a suitable rubber firewall grommet and route the switch wiring from the cab into the engine bay.
Use care when passing the terminals through the firewall so they are not bent or damaged.
Continue with your vehicle
Select your vehicle make for model-specific installation instructions.
Cummins
2006-2021
CSP Switches plug into the OBD2 port, and offer a pass-through port for use of aftermarket monitoring equipment or diagnostic tools.
No additional wiring or ECM pinning is required.
2022-2024 CMF on EZ
5. Install the wires into the supplied connector
Inspect the terminals before installation to make sure they were not damaged while routing the wiring.
With the connector clip side up as shown in the reference image, install the wires from left to right as follows:
White — Left Terminal
Black — Middle Terminal
Red — Right Terminal
Push each terminal fully into the connector until it locks into place. Gently pull on each wire afterward to confirm it is properly retained.
6. Locate and disconnect the factory CCV connector
Locate the factory CCV sensor connector.
Release the connector lock and unplug the factory wiring harness connector from the CCV sensor.
7. Connect the switch
Connect the newly assembled switch connector to the factory CCV wiring harness connector that was just unplugged from the sensor.
The CCV sensor itself will remain disconnected.
Secure the switch wiring away from hot, sharp, or moving components.
8. Install your SOTF tuning
Install the appropriate SOTF tuning through the EZ Lynk application.
Once programming is complete, the SOTF switch will now be functional.
Troubleshooting
Red to White
- Resistance: 2200 Ω
Black to Red
- Voltage: 5V
Black to White
| Position | Resistance | Voltage |
|---|---|---|
| 1 | Open | 5.0V |
| 2 | 5600 Ω | 3.5V |
| 3 | 2200 Ω | 2.5V |
| 4 | 1000 Ω | 1.5V |
| 5 | 270 Ω | 0.5V |
Duramax
2001-2004 LB7
5. Locate the ECM
Open the hood and locate the ECM near the driver-side battery at the front of the engine compartment.
Important: Do not confuse the ECM with the Allison TCM mounted near the driver-side fan shroud.
6. Check and clean the ECM connector area
Before disconnecting the ECM harness, inspect the connector and surrounding area for dirt, dust, sand, or other debris.
Clean the area as needed before unplugging the connector to prevent contaminants from falling into the ECM or connector, or damaging the terminals and seals during removal or reassembly.
Do not allow dirt, moisture, or debris to enter the ECM connector or terminal cavities.
7. Disconnect the ECM connectors
Disconnect the electrical connectors from the ECM.
A 7mm socket is required to loosen the ECM connector retaining bolts.
8. Route the switch wiring to the ECM
Route the switch wiring safely from the firewall to the ECM harness.
If protective conduit is supplied with the switch, install it over the wiring to help protect the wires from heat and abrasion.
Secure the wiring away from hot, sharp, or moving components.
9. Open the blue ECM connector
Locate the blue connector on the ECM harness.
Using a small flathead screwdriver, carefully remove the gray cover from the connector.
Use care when removing the gray cover. It can be difficult to release and may break if excessive force is used.
10. Locate pins 49 and 69
Locate pin cavities #49 and #69 in the blue ECM connector.
The cavity numbers are molded into the connector and may require close inspection to see.
11. Remove the blue terminal retainers
On the wire side of the connector, carefully release and remove the blue terminal retainers.
A small flathead screwdriver can be used to gently release the retaining tabs on each side.
12. Install the switch wires
Insert the two DSP5 switch terminals into:
- Pin #49
- Pin #69
Wire color does not matter for this connection. Either switch wire may be installed in either cavity.
Push each terminal fully into the connector until it locks into place. Compare the installed terminals with the surrounding factory terminals to make sure they are fully seated.
13. Reinstall the terminal retainers
Reinstall the blue terminal retainers and make sure they are fully seated.
14. Reinstall the connector cover
Reinstall the gray cover on the blue ECM connector and make sure it is fully secured.
15. Reconnect the ECM
Reconnect the ECM harness connectors and tighten the retaining bolts.
Secure the switch wiring as needed so it cannot contact hot, sharp, or moving components.
Once everything is reconnected, the DSP5 switch installation is complete.
2004.5-2005 LLY
5. Locate the ECM
Open the hood and locate the ECM near the driver-side battery at the front of the engine compartment.
Important: Do not confuse the ECM with the Allison TCM mounted near the driver-side fan shroud.
6. Check and clean the ECM connector area
Before disconnecting the ECM harness, inspect the connectors and surrounding area for dirt, dust, sand, or other debris.
Clean the area as needed before unplugging the connectors to prevent contaminants from falling into the ECM or connectors, or damaging the terminals and seals during removal or reassembly.
Do not allow dirt, moisture, or debris to enter the ECM connectors or terminal cavities.
7. Disconnect the ECM connectors
Disconnect the ECM harness connectors from the ECM.
8. Route the switch wiring to the ECM
Route the switch wiring safely from the firewall to the ECM harness.
If protective conduit is supplied with the switch, install it over the wiring to help protect the wires from heat and abrasion.
Secure the wiring away from hot, sharp, or moving components.
9. Locate the gray ECM connector
Locate the gray ECM connector and make sure the connector locking mechanism is in the fully open position.
10. Remove the black connector cover
Using a small flathead screwdriver, carefully release the two retaining tabs and remove the black cover from the top of the gray connector.
Use care not to damage the cover or retaining tabs.
11. Locate pins 32 and 50
Locate pin cavities:
- Pin #32
- Pin #50
The cavity numbers are molded into the connector and may require close inspection to see.
12. Remove the teal terminal lock
Carefully remove the teal-colored terminal lock from the connector.
Once the terminal lock is removed, avoid pulling on the connector wiring, as the terminals are no longer fully retained in position.
13. Remove the cavity plugs
Remove the light-blue cavity plugs from pin #32 and pin #50.
Take care not to damage the surrounding terminals or connector seals.
14. Install the DSP5 switch terminals
Insert the DSP5 switch terminals into cavities #32 and #50.
Push each terminal fully into the connector until it is completely seated and locked into position.
15. Reinstall the terminal lock
Reinstall the teal-colored terminal lock and make sure it is fully seated.
16. Reinstall the connector cover
Reinstall the black cover on the gray ECM connector and make sure both retaining tabs are secured.
17. Reconnect the ECM
Reconnect the ECM connectors in the following order:
- Gray connector
- Black connector
- Blue connector
Make sure each connector is fully seated and locked into place.
Secure the switch wiring as needed so it cannot contact hot, sharp, or moving components.
Once everything is reconnected, the DSP5 switch installation is complete.
2006-2010 LBZ / LMM
5. Locate the ECM
Open the hood and locate the ECM near the driver-side battery at the front of the engine compartment.
Important: Do not confuse the ECM with the Allison TCM mounted near the driver-side fan shroud.
6. Check and clean the ECM connector area
Before disconnecting the ECM harness, inspect the connectors and surrounding area for dirt, dust, sand, or other debris.
Clean the area as needed before unplugging the connectors to prevent contaminants from falling into the ECM or connectors, or damaging the terminals and seals during removal or reassembly.
Do not allow dirt, moisture, or debris to enter the ECM connectors or terminal cavities.
7. Disconnect the ECM connectors
Disconnect the ECM harness connectors from the ECM.
8. Route the switch wiring to the ECM
Route the switch wiring safely from the firewall to the ECM harness.
If protective conduit is supplied with the switch, install it over the wiring to help protect the wires from heat and abrasion.
Secure the wiring away from hot, sharp, or moving components.
9. Open the larger ECM connector
Locate the larger ECM connector.
Place the connector locking mechanism in the closed position, then use a small flathead screwdriver to carefully remove the connector cover.
10. Remove the purple terminal lock
Carefully remove the purple terminal lock that retains the terminals inside the connector.
Once removed, avoid pulling unnecessarily on the connector wiring.
11. Locate pins 46 and 54
Locate pin cavities:
- Pin #46
- Pin #54
The cavity numbers are molded into the connector and may require close inspection to see.
12. Install the DSP5 switch terminals
Insert the DSP5 switch terminals into cavities #46 and #54.
Push each terminal fully into the connector until it is completely seated and locked into position.
13. Reinstall the terminal lock
Reinstall the purple terminal lock and make sure it is fully seated.
14. Reinstall the connector cover
Reinstall the ECM connector cover and make sure it is properly secured.
15. Reconnect the ECM
Reconnect the ECM connectors in the following order:
- Larger connector
- Smaller connector
Make sure each connector is fully seated and locked into place.
Secure the switch wiring as needed so it cannot contact hot, sharp, or moving components.
Once everything is reconnected, the DSP5 switch installation is complete.
2011-2016 LML
5. Locate the ECM
Open the hood and locate the ECM.
Remove the ECM shield by releasing the retaining tab at the rear of the shield and pulling the shield toward the opposite side of the engine.
6. Check and clean the ECM connector area
Before disconnecting the ECM harness, inspect the connectors and surrounding area for dirt, dust, sand, or other debris.
Clean the area as needed before unplugging the connectors to prevent contaminants from falling into the ECM or connectors, or damaging the terminals and seals during removal or reassembly.
Do not allow dirt, moisture, or debris to enter the ECM connectors or terminal cavities.
7. Disconnect the ECM connectors
There are three ECM connectors:
- Black — J1
- Blue — J2
- Gray — J3
The switch wiring will be installed into the Gray J3 connector.
It is generally easiest to disconnect all three connectors, starting with the connector closest to the front of the truck and working toward the firewall.
Each connector has a red locking tab. Use a small flathead screwdriver or pick to carefully slide the red lock outward.
Press the release tab on top of the connector and move the locking lever until it stops. Disconnect the connector and repeat for the remaining two.
8. Position the Gray J3 connector for access
To gain enough room to work on the Gray J3 connector, carefully route it underneath the power-steering line and bring it upward into a workable position.
Avoid pulling or placing unnecessary strain on the factory wiring.
9. Remove the upper connector cover
Cut the zip tie securing the upper connector cover.
There is a retaining tab on each side of the Gray J3 connector. Carefully release both tabs with a small flathead screwdriver and remove the upper harness cover.
10. Remove the lower gray terminal cover
Carefully remove the gray cover from the bottom of the connector.
A small flathead screwdriver or pick can be used to gently release each corner.
Use extreme care with this cover. The retaining features can break easily.
Once removed, the ECM terminals will be exposed. Take care not to bend or damage any of the terminals.
11. Locate the correct pin cavities
The required cavities depend on model year:
2011–2014
- Pin #11
- Pin #48
2015–2016
- Pin #27
- Pin #46
Verify the cavity numbers carefully before installing the switch terminals.
12. Remove the cavity plugs
Unused terminal locations may contain plastic cavity plugs.
Use a small straight pick, the blunt end of an appropriately sized drill bit, or a similar tool to apply light pressure and remove the plugs.
Take care not to damage the connector or surrounding terminals.
13. Check for existing factory terminals
On some trucks, one or both required cavities may already contain a factory terminal.
If a required cavity is occupied, carefully release the terminal retaining mechanism and remove the existing terminal.
Insulate the removed factory terminal with electrical tape and secure it safely out of the way.
14. Install the switch terminals
Insert the switch terminals into the appropriate cavities for the vehicle year.
The terminals are directional and must be installed in the correct orientation to lock into place.
Push each terminal fully into the connector and confirm that it is securely retained.
15. Reassemble the Gray J3 connector
Reinstall the lower gray terminal cover.
Reinstall the upper harness cover and secure it as required.
16. Route and protect the switch wiring
Route the switch wiring neatly along the factory harness.
If protective conduit is supplied with the switch, install it over the wiring to help protect against heat and abrasion.
Carefully route the Gray J3 connector back underneath the power-steering line and into its original position.
17. Reconnect the ECM
Reconnect the ECM connectors beginning with the Gray J3 connector, then continue toward the front of the truck.
Make sure each connector is fully seated, the locking lever is completely engaged, and the red locking tab is returned to the locked position.
Reinstall the ECM shield.
Secure the switch wiring as needed so it cannot contact hot, sharp, or moving components.
Once everything is reconnected, the switch installation is complete.
Powerstroke
2011-2014
5. Install the switch connector
Once the switch wiring has been routed into the engine bay, install the two switch terminals into the supplied connector.
Either wire may be installed in either cavity.
Push each terminal fully into the connector until it locks into place. Gently pull on each wire afterward to confirm it is properly retained.
6. Locate the fuel temperature/pressure sensor connector
Locate the factory connector for the fuel temperature/pressure sensor.
Disconnect the factory wiring harness connector from the sensor.
7. Connect the switch
Connect the newly assembled switch connector to the factory fuel temperature/pressure sensor harness connector.
The factory sensor itself will remain disconnected.
Protect the exposed sensor connection from moisture, dirt, and corrosion using electrical tape or another suitable weather-resistant method.
8. Protect and secure the wiring
If protective conduit is supplied with the switch, install it over the wiring to help protect against heat and abrasion.
Secure the switch wiring away from hot, sharp, or moving components.
Once everything is connected and secured, the SOTF switch installation is complete.
2015-2019
5. Install the switch terminals into the supplied connectors
Once the switch wiring has been routed into the engine bay, install the terminals into the supplied male and female connectors.
Install the wires as follows:
- Single brown wire: Install into the outside open cavity of the female connector.
- Split wire — female side: Install into the center open cavity of the female connector.
- Split wire — male side: With the yellow lock facing up, install the terminal into the center open cavity of the male connector.
Push each terminal fully into place and make sure it is securely retained.
Once the male connector has been pinned, slide the blue terminal lock into position to secure the terminals.
6. Locate the fuel temperature/pressure sensor connector
Locate the factory fuel temperature/pressure sensor connector and disconnect the factory wiring harness from the sensor.
7. Connect the switch harness
The switch harness installs inline between the factory wiring harness and the fuel temperature/pressure sensor.
Connect:
- One end of the switch harness to the fuel temperature/pressure sensor
- The other end to the factory wiring harness connector
Make sure both connections are fully seated and locked.
8. Protect and secure the wiring
If protective conduit is supplied with the switch, install it over the wiring to help protect against heat and abrasion.
Secure the switch wiring away from hot, sharp, or moving components.
Once everything is connected and secured, the SOTF switch installation is complete.
2020-2022
5. Install the switch terminals into the supplied connector
Once the switch wiring has been routed into the engine bay, install the two switch terminals into the supplied connector.
Either wire may be installed in either cavity.
Push each terminal fully into the connector until it locks into place. Gently pull on each wire afterward to confirm it is properly retained.
Use the reference image below to verify the connector and terminal arrangement.
6. Locate the fuel temperature/pressure sensor connector
Locate the factory fuel temperature/pressure sensor connector in the engine bay.
Use the reference image below to identify the correct connector location.
7. Disconnect the factory sensor connector
Disconnect the factory wiring harness from the fuel temperature/pressure sensor.
Take care not to damage the connector lock or wiring.
8. Connect the switch
Connect the newly assembled switch connector to the factory fuel temperature/pressure sensor harness connector.
The factory sensor itself will remain disconnected.
Protect the exposed sensor connector from dirt, moisture, and corrosion using electrical tape or another suitable weather-resistant method.
9. Protect and secure the wiring
If protective conduit is supplied with the switch, install it over the wiring to help protect against heat and abrasion.
Secure the switch wiring away from hot, sharp, or moving components using zip ties or another suitable method.
Once everything is connected and secured, the SOTF switch installation is complete.
2023-2026
5. Install the switch terminals into the supplied connector
Once the switch wiring has been routed into the engine bay, install the two switch terminals into the supplied connector.
Either wire may be installed in either cavity.
Push each terminal fully into the connector until it locks into place. Gently pull on each wire afterward to confirm it is properly retained.
6. Locate the charge air temperature sensor
Locate the factory charge air temperature sensor and its electrical connector.
Use the reference image below to identify the correct sensor location.
7. Disconnect the factory sensor connector
Disconnect the factory wiring harness connector from the charge air temperature sensor.
Take care not to damage the connector lock or wiring.
8. Connect the switch
Connect the newly assembled switch connector to the factory charge air temperature sensor harness connector.
The factory sensor itself will remain disconnected.
Protect the exposed sensor connector from dirt, moisture, and corrosion using electrical tape or another suitable weather-resistant method.
9. Protect and secure the wiring
If protective conduit is supplied with the switch, install it over the wiring to help protect against heat and abrasion.
Secure the switch wiring away from hot, sharp, or moving components using zip ties or another suitable method.
Once everything is connected and secured, the SOTF switch installation is complete.