How to Test Speedometer Calibration

how to test speedometer calibration

A vehicle’s computer reads the magnetic field pulses in order to determine the rotational speed of the driveshaft. This determines the speed at which the vehicle is going. If you suspect that your speedometer is giving the incorrect readings, here is how to test speedometer calibration.

First, a measured mile is required. Interstate highways and some country roads have mile markers but this method should only be down in a safe manner. Before beginning driving the mile, take note of the mileage the odometer has. Reset the trip odometer to 0.0. Drive a mile according to the mile markers or your measure mile. Then take note of the reading on the odometer. If the odometer is saying that you drove more than a mile, then it is calculating a faster speed than your actual speed. Similarly, if it is displaying that you drove under a mile, then it is calculating that you driving slower than you actually are.

Now that you know how to test speedometer calibration, you can take the next step and calibrate it. However, if you are unable to fix the issue, it is a good idea to bring it to a professional like Safety Restore. Safety Restore is a company that specializes in post accident repair. They can help your vehicle get back on the road giving the driver the correct readings for everything. Safety Restore can help in rebuilding tachometer gauge, oil gauge repair, temperature gauge repair, gas gauge repair, and the car odometer repair. All you need to do is send them your item and you can save up to $600 as compared to buying a new one at the dealer. Once they receive it, they will repair and ship it back within 24 hours, saving you both time and money. Visit to learn more how they can help you get back on the road driving safely.