Rough Country Speedometer Calibrator for 2018-2020 Ram 1500 Truck - 90019

Resets your speedometer to accurate readings for larger tires. Reads diagnostic codes like "check engine light" Easy Plug and Play connection with Option to return to stock settings Updates OE ECM Shift Points to accommodate larger tires Recalibrates Electronic Stability Control to work with larger tires Backed by Rough Country for 1 Year