
07-28-2008, 08:55 AM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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Not Ranked
Speedometers are generally calibrated to three points on the dial. In the case of after market, I think it would be best to set for 70 with a GPS or State trooper.
Mine is set right on by asking a trooper to ride next to me at 70 his car and my GPS. Actually I asked him to drive 70 on I75 and I got next to him. He was a very nice person, one of the guys who came out for the inspection.

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