Sorry but you would screw up your very nice Speedo-head unit, and that would be really sad.
All Speedometer heads are calibrated to the same curve. (ALL GM speedos turn 1001 rpm @ 60 mph, or 1001 revs per mile).
If you messed with the needle position you would be right at a single point on the speedo gage and still off every where else.
What rear axle gear do you have in your car?
What tire size do you have on your car?
What Transmission do you have in your car?
What changed from when the car was stock out of the plant?
If you can answer these questions, then we can help.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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