A guage/ auto electric or speedometer shop can recalibrate the speedometer to adjust for bigger or smaller tire size. Why do you want to know that?
Take it in to your local dealer or local repair shop(call first to see if they have the equipment) and they should be able to recalibrate it for a small price.
to recalibrate spedo, u need to go to a mechanic that has electronic equipment to read your computer. recalibrating is done thru computer
Speedometer calibration differs depending on the vehicle and age. Some cars are calibrated by a technician with a computer program. Others require a gear change to drive the speedometer at a different ratio.
The easiest thing to do is to go to a speedometer shop and have them recalibrate the speedometer.
If it's old enough to have a mechanical speedometer, it'll be in the speedometer itself. If it has an electronic speedometer, there is no speedometer gear - to recalibrate the speedometer to match something like, say, changing tire size would require changing the parameters in the engine ECM.
Jet Accu Speed Speedometer calibrator. It adjusts your speedometer for bigger tires or gear change. Only works on automatic transmissions.
May have to take the truck to a certified speedometer repair shop
You will need to remove the instrument panel cover. Remove the retaining screws from the speedometer. The lightbulb will be on the back of the speedometer.
why does speedometer come on and off ?
no fuse, it is cable driven, not electronic
It is time to recalibrate the scales.