Fits Chevy/GMC 1500/2500HD 2WD/4WD Speedometer Calibrator; 90045 blh 8 V8 1969 - 1974

8 V8 1969 - 1974 Ford Galaxie 500 351/5

base tune easily created via handheld Wizard

5 V8 1969 Dodge Dart Swinger 170/2

6 V8 1974 - 1975 Pontiac Grand Am 400/6

Fits Chevy/GMC 1500/2500HD 2WD/4WD Speedometer Calibrator; 90045 blh 8 V8 1969 - 1974Speedo Calibrator Chevy GMC 1500 2500HD (19 22) Put the finishing touch on your lifted vehicle with Rough Country's Speedometer Calibration Device! This easy to use Speedometer Calibrator helps you quickly and easily reprogram your vehicle's speedometer to match the output of your larger tires. Your vehicle's computer is designed to track the speed based on your stock tire height. When upgrading to larger tires, there will be a discrepancy between