2002 GMC Sierra 3500 Speedometer Calibrators

Speedometer Calibrators

Having a properly calibrated speedometer on your truck, Jeep, or SUV isn’t just convenient but also a legal requirement for operating a vehicle on public roads! This essential gauge relays information from one or more speed sensors to the driver to illustrate how fast you're driving in real time! With an improperly calibrated speedometer, you’ll be unaware of your driving speed, which may result in unknowingly driving at dangerous rates, speeding tickets, or other citations. 

But how would a speedometer read incorrectly, anyway? Aside from a broken speed sensor, damaged wiring, or a broken motor in the gauge cluster, the most common reason for an improper speedometer reading is simple. You may even have an improperly calibrated speedometer without knowing! 

Speedometers rely on information provided by speed sensors, which are programmed to your vehicle’s factory options, including tire size and differential gear ratio. Changing any one of these components can throw off the speed sensors and, thus, the speedometer! Not only does an improper speedometer reading throw off the numbers on your dash, but it can also negatively impact mileage and transmission shift points, leading to poor drivability. 

Fortunately, RealTruck has the solution: Speedometer Calibrators! These handy devices allow you to change parameters in your vehicle’s computer, like tire size and differential gear ratio. Once corrected, the speedometer will display accurate readings, the odometer will read correctly, and your vehicle’s shift points will return to normal, making for a safer and more enjoyable driving experience.

Choosing a Speedometer Calibrator

At RealTruck, we offer a wide selection of speedometer calibrators from top brands, including Hypertech and Superchips. Our speedometer calibrators range in features, from simple speedometer recalibrations to advanced features, like: 

• Tire pressure adjustment

• DTC (diagnostic trouble code) reading

• Full-color displays

• Mobile app compatibility

• Auto start/stop disable