Pardon me, instead of starting a new thread, I just choose to inquire on this exisitng thread. Mods, I apologize if i had a violation...

Does anyone know how to calibrate a speedometer?

Last month, I DIY'ed replacing my speedometer because its busted. I bought a surplus but only opted to take out the speedmeter module because wiring are not compatible (maybe 94 is differenent from 97 wiring? not sure).

After doing replacement, it works as it is.. but.. speed is way off... I tried test driving with other car.. other car read 60kph.. while mine.. does 100kph!...

Can anyone help me out on how to calibrate this? or is it the sensor? (Car is A/T 94 corolla - gli)

Thanks for your replies.