Speedometer was working fine, drove it the other morning and now it works fine to 50 mph then starts to bounce back and forth 10 mph. Anything above 50 it bounces 50 to 60 or 60 to 70mph. Any ideas?
I have had them do that when the cable was binding. If the cable is not broken, you might try lubricating it with graphite. I also had a damaged speedo gear (plastic one) do similar things.