6-Position Diesel Rotary Switch

Change maps at the turn of a switch. This 6-position rotary switch lets you step from your stock calibration to any of five custom maps without stopping to re-flash. It works with HP Tuners' Switch on the Fly operating system for the GM L5P Duramax and the Ram Cummins.

The Diesel Switch is specific to the application you select above. It is not universal or interchangeable.

What's included

• Six-position rotary switch
• Knurled aluminum knob and position dial
• 5-foot OBDII pass-through cable

Which one do I need?

• GM E41-L5P: 2017 and newer Chevrolet and GMC trucks with the 6.6L L5P Duramax
• Cummins CM2350: 2013-2018 Ram trucks with the 6.7L Cummins
• Cummins CM2450: 2019-2024 Ram trucks with the 6.7L Cummins

How Switch on the Fly works

Switch on the Fly is a custom operating system change made in your tune. It stores the stock calibration plus five additional maps in the ECM at once. Turn the switch, or use the factory cruise-control buttons, to change maps while you drive.

There are plenty of ways to mount the switch in your cab, including two OBDII-port brackets you can 3D print. Download the bracket files.

L5P user guide (PDF) | Cummins user guide (PDF)