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Originally Posted by Matt L
The problem with this method is that you can only get it to read right at a single speed.
I once calibrated one the other way, which involves adjusting the spring which returns the needle to zero. It wasn't extremely hard, and worked great,
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True, I got mine pretty close at about 75 or 80, but it seems to be within a couple of mph at lower speeds, based on those roadside signs in 35 mph zones. Actually, I'm a little surprised it worked at all. Someday I'm sure I'll have to have it calibrated correctly, or just replace it.
