Unless it is really not put back together right, it might start working again if
you run it around all the way to zero... all the way around past zero and back again.
I've somehow jiggered mine up once or twice when resetting at
the gas pump only to look down and see that it isn't counting up
the miles until I have to start pushing... spinning it around and resetting
it to zero has got it going again for me...
-Mike
Yeah, Mike, you're right on that.
I'm in the habit of resetting the trip meter every time I gas up, which I believe most do.
The odometer does get "stuck" if you're not careful to reset it correctly.