FOR GAS VEHICLES * Regular/Premium/E-85 tuning * Speedometer calibrator * Change top-speed & rev limiter * Adjust automatic transmission shift points & firmness * Adjust cooling fan "on/off" temps * Read, display, & clear DTCs * Easy plug-and-go installation------------------- FOR DIESEL VEHICLES * 3-Stage Tuning * Speedometer calibrator * Top-speed limiter * Adjust automatic transmission shift firmness * Adjust cooling fan "on/off" temps * Read, display, & clear DTCs * Easy plug-and-go installation