> Went by one of those radar detector signs today and it said I was actually
> going approximately 5 mph slower than the my speedo said I was going. Does
> that mean that I need a speedo gear with more teeth and if so, how many
> (more) teeth? - or what???
Depends on what speed you were going. The faster you go, the more the error
tends to be.
However, don't count on the radar system being correct. Went past two today
in our truck, and we were going a lot faster than the sign said we were.
Either it was way out of calibration, or it was locking on the car ahead of
us.
Try timing against highway mile markers or using a handheld GPS receiver to
test things.
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