NEWPORT NEWS, Va. - Nine years ago, Jeff Caplan was working on a 1980 five-series BMW and needed to fix the odometer. "Every speedometer shop I contacted said the same thing, 'You have to send it in.

The only way you'll know if your car hits the 200,000 mile mark is by having a functioning odometer. But the plastic gears that turn an analog odometer have a tendency to break, which causes the ...

If you've ever modified a car with smaller or larger tires or, perhaps, a different final-drive gear, you've immediately screwed up your speedometer. This is, of course, annoying, but for modern cars ...