Fish Tuning DSP5 Switch (DSP5LML / FTDSP5LML) for 2011-2016 LML Duramax

Take full control of your 2011-2016 GM 6.6L Duramax LML with the Fish Tuning DSP5 Switch. This 5-position rotary switch lets you change between multiple EFILive DSP5 tunes on the fly—without stopping, reflashing, or plugging anything in.

Pair it with a compatible DSP5 tune file and instantly select the right power level for the job: economy/daily driving, light or heavy towing, street performance, or maximum output. The switch feeds a discrete signal to the ECM so fuel, timing, boost, and torque maps update in real time while you drive.

Key Features

• Designed specifically for 2011–2016 LML Duramax (Chevy Silverado / GMC Sierra 2500HD & 3500HD)
• Yellow/black wire configuration with LML-specific pins
• Smooth 5-position rotary switch with aluminum knurled knob and 1–5 position decal
• Includes installation hardware and split loom for a clean install
• Compatible with EFILive DSP5 tuning (also works with many EZ Lynk SOTF setups)
• Simple DIY install—wires into the ECM (commonly pins 11 & 35; always confirm pinout with your tuner)

Important: Tuning is not included. This switch only works with a properly built DSP5 (or equivalent multi-map) calibration already loaded on the ECM. Some tuners (e.g., certain MotorOps or Calibrated Power files on later years) may require the alternate blue/white switch version—confirm with your tuner before ordering.

Unlock true switch-on-the-fly versatility for your LML. One switch. Five tunes. Instant control.