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It seems that everyone has a different idea about how to find the right calibration for the speedo. My favorite so far is this one:
http://chevelleengineer.home.comcast.net/~chevelleengineer/speedo.htm
The math is simple, and it’s easy to get in the right ballpark. After pulling the gear, it’s currently a 39 tooth brown gear. Let’s do the math:
The car says 80, but it’s more like 55. That’s a ROUGH estimate, but with these initial facts I can deduce that I’ve got about s 45% error. The estimate might be wrong, but the math is right. That means that I need to add 18 teeth. That would mean I need a 57 tooth gear, but the biggest is 45, so I guess I’ll order that and give it a whirl. With the crazy ass tires, who knows if I’ll ever get an accurate reading. The good news is that they’re only $6 a pop, so it’s not a big expense if I’m wrong. However, I hate to spend 6 bucks to get hit with $8 shipping, so I need to figure out what else I should get while I’m thinking about it.
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Ben\'s 1967 Pontiac Firebird 400 Rod & Restoration 