Speedometer Calibrator | Chevy/GMC 1500/2500HD 2WD/4WD

Rough Country's Speedometer Calibration Device puts the finishing touch on your lifted vehicle, quickly and easily reprogramming your speedometer to match the output of your larger tires — your vehicle's computer tracks speed based on stock tire height, so upgrading to larger tires creates a discrepancy between actual speed and the speedometer readout.

Plug and Play: Connects directly to your vehicle's Diagnostic Link Connector Port; in just a few minutes your speedometer reads true again. Updates your vehicle's ECM, ensuring accurate shift points and proper electronic stability control — not just the in-dash readout.

Reversible: Includes a function to reset the speedometer back to stock prior to servicing the vehicle.

Warranty: Includes a 1-Year Warranty.