Fixing a Speedometer??

The speedometer is not electric, it is magnetic. There are springs and bearings that fail with miles of use.

I have been using the services of this outfit in Denver for most of twenty years; they have not yet failed to quickly, economically, and completely repair the speedometers I send them (though I imagine sooner or later they might call and say "We can't fix this one, it's too far gone"; it hasn't yet happened).