Calibrating Mechanical Speedometer

Calibrating Mechanical Speedometer

The vehicles speedometer has the job of giving an accurate estimation of the speed we are driving at any given moment. Cars coming from a dealer have the speedometer already calibrated to the vehicle’s stock parts. However, if particular parts are changed, like the cars tires, the speedometer needs to be calibrated. Otherwise, you will be given the incorrect speed. Cars that are salvage will also need to get calibration.


A dealer may charge a large amount, so some decide to tackle this themselves. If you have a mechanical speedometer, Here are a few simple steps on how to do a speedometer adjustment.


If you have a mechanical speedometer you would start by opening the vehicle’s hood and locating the transmission. Next, unscrew the speedometer cable and unscrew the bolt holding the gear housing cover. After removing the plate, you will see two gears. Count the number of teeth the gears have and remember it for later. Next, get the diameter of the tire and divide 20,168 by the tire’s diameter. This is the tire’s revolutions per mile. Multiply this by the amount of teeth your gears have and multiply again by the vehicle’s axle ratio (which can be found in the vehicles supporting documents). Purchase the necessary driven gear for your vehicle. Remove the old driven gear by pulling it out of its clips and clip in the new driven gear. Secure the gear housing cover and the speedometer cable back.


However, if you aren’t handy with cars, don’t have the time, or just need help, it may be best to take it to a professional. They will make sure it is done correctly and safely. Safety Restore is a post accident restoration company that can help with no worry on the speedometer adjustment cost with them! They can save you hundreds on their services with their cluster repair service for only $118.99! Visit SafetyRestore.com to securely purchase the service. Then, simply remove the cluster from your vehicle and ship it to their warehouse. Their expert technicians will repair and send back your cluster within 24 hours.