How to tell if speedometer is way off?

Guest

I believe my speedo on my P-car is not accurate. Is there an easy way to check?
Besides following someone else at a known speed? And would changing wheel and tire size have caused this, or something else.
I know the car is 28 years old, and have no
idea if it has the original tranny or whatever. And what does one do to fix it?
Change a gear somewhere in the tranny that connects to the speedometer? Or does this connect elsewhere? Thanks.

2/25/028:14 AM

Original Post

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