Fits: 2017 thru 2019 Chevy Silverado/GMC Sierra 2500HD/3500HD L5P Duramax Diesel

*NOT LEGAL FOR SALE OR USE IN CALIFORNIA. THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT MAY ALSO BE ILLEGAL NATIONWIDE UNDER THE FEDERAL CLEAN AIR ACT (42 U.S.C. § 7522(A)(3))

Hypertech’s Speedometer Calibrator is an in-line module to correct the speedometer for non-stock tire sizes and/or rear gear ratios. This module is perfect for vehicles with computers that don’t allow for tire size and/or rear gear ratio correction or re-calibrate for tire sizes and/or rear gear ratios outside the range of programmers.

If you’ve installed tires that are larger or smaller than the original equipped tires, or if you have installed a ring and pinion gear set with a different rear gear ratio, the Speedometer Calibrator allows you to correct speedometer readings. The vehicle’s computer calculates your vehicle’s speed based on the diameter of the stock tires. If you’ve installed taller or shorter tires, or changed the rear gear ratio, the vehicle’s computer doesn’t know how fast your vehicle is going. As a result, the speedometer readings will not be accurate (as required by law).

Using the USB cable connect, the In-line Speedometer Calibrator Module to your PC and enter the new tire height and/or rear gear ratio. There are no limitations for increasing tire height or rear gear ratios. Next, disconnect the factory connector to the instrument cluster (behind the dash), snap in the Speedometer Calibrator Module, reconnect the cluster, and you’re done! In a matter of minutes, you can accurately correct your speedometer readings (as required by law).

Features:

• Allows calibrations for new gear ratios
• Allows calibrations for non-stock tire sizes

Includes:

• Hypertech Speedometer Calibrator

Notes: 

• Please make sure you have the latest software update before proceeding. Visit Hypertech's website for the latest updates.
• This product is ONLY designed for closed course racing where it is legal to do so. Any other use will be in violation of local, state, and federal laws. We are not responsible for the unlawful use of this product.
• This product may void your manufacturer's warranty