20 miles an hour off.if i am doing 55mph speedometer isdoing75mph.

install a spedometer with kilometer markings or manualy paint markings on at proper locations. 88 kph = 55 mph, etc.

if you were thinking you could push a button, not gonna happen.

Sounds like you need to replace your speedometer cable that runs from your dash to your transmission.

A place in Flint Michigan will repair this problem (speedo motor) for 100.00 and will replace all the other motors associated with your dash instruments. Off of Hill Road Near I-75. Did my truck in 20 minutes. Works Great!!! Business called Speedometer Something.

It's a cable. If the car doesn't have the same size tires that it came with from the factory, the speedometer will be off. The only way to calibrate it would be to change the the cable drive gears in the transmission, but I have no idea what the gear ratio would be or where you would get the gears. That car came with either P215/75R14 or P205/75R15 tires.

My 96 did the same thing. The speed sensor is and was fine -- the problem is an open circuit in the wires inside the gauge itself.

The Chilton's manual has pretty good instructions on how to replace the instrument cluster. You can buy just the speedometer gauge, or an entire instrument cluster for $100 or so on eBay. Just be sure you get a cluster that matches your model and trim line -- the LX and DX have different clusters, and of course the automatic and the 5-speed are different as well.


Do be sure to disconnect the battery before you begin the project, as there's a (slim) chance you can discharge the airbags if you don't

A vehicle speed sensor that is starting to fail could cause this, or less than likely bad wiring or connections, or yes, a bad cluster could do this... But how exactly did she notice the speedometer was 10MPH fast?? There are no real accurate speedometers in vehicles (Don't get me wrong they shouldn't be off by 10MPH) but there is a 5 or so percent difference high or low in many vehicles even with stock powertrains. I've plugged in with a diagnostic scanner on many vehicles and the dash speedo shows 60MPH, but the electronic speed readout on the scanner reads as low as 55MPH or as high as 65MPH

Yeah you may need a whole new dashboard because the whole panel circuit for may be messed up.

Yes. You also want to check your alternator. Weird as it sounds our electronic dash on a Lincoln had us doing 55mph at a stop. It was the alternator and you may need to check your backup generator for clean power. There is some kind of electronic term regarding "Sine" waves, that apparently matters alot. Good Luck

If you have replaced your stock size tires with oversize aftermarket tires and wheels (17 inch stock wheels to 22 inch wheels, etc) you need to have the computer reflashed to compensate for the larger tire size. Larger tires turn slower to maintain the same groundspeed, giving a false speed reading.

Most speedometers are off by a few miles per hour even when new, this is normal
but yours could be caused by putting different size tires on the car check the owners manual for correct size tires