[grok]

Since day one the odometer has been working fine. A short while ago my 140 mph speedometer stopped working until I hit 50 mph. It then reads the speed less 50 mph. Nothing is draging on the inner speedo disk. When I spin the outer (speedometer driven fork-like) component the speedo needle does not move. On the 85 mph unit I have I can spin the outer component by hand and I can easily get it to read up to 30 mph.

Does this assembly work with magnets? What could be the issue?