How can I calibrate my speedometer on my 90 gt mustang?

BobByInNH

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It has 4-11 rear gears and was never done. Is a dyno machine nessesary or is it possible to do myself? If I can't....what type of shop do I look for? Thanks
 
The speedo is connected through the transmission and the guage itself, between those 2 there is no adjustment.
 
The speedo is connected through the transmission and the guage itself, between those 2 there is no adjustment.
 
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