Switch Tunes on the fly and Data Log your Cummins from the convenience of your phone or tablet! You MUST have an EFILive tuned Cummins with CSP5 tuning installed in the truck. The StarLogs app will not function without a StarLite Diesel blue-tooth adapter that has been certified/secured to YOUR vehicle (done at the time of purchase). Tuning is NOT required to be StarLite Diesel tuning - only the Bluetooth hardware for the app is required to be from StarLite Diesel. This app is copyrighted by Starlight Diesel.