95 z28 speedometer calibration

[steveo]

you'll never get a perfect speedometer. too many variables throwing flexible rubber at something. just aim for 'close enough for a cop'. even factory calibrated speedos with brand new OEM tires can be off by quite a bit.

[LeMarky Dissod]

First you said it read 35MpH @ 55MpH actual.
Next, it read 55MpH @ 67MpH actual.
My calculation used the wrong tires.
If it reads close, but slightly faster than actual, then that'll be good enough to help you avoid speeding tickets.

[LSVolvo940]

you can make it read right, and yes it does matter if it does not read right. This helps me and actually prompted me to disable top speed cut to get the car down the road. Now its way closer , looking forward to doing more with these cars.