'76 300D intermittent odometer/jumpy speedometer ??

My odometer stopped working about a week ago for a day. It's worked 90% of the time over the past week, but there's a problem in there somewhere. Also, my speedometer is jumpy under 15mph. Not sure if the two are related. Took out the instrument cluster and noticed that one of the corners on the speedo cable is rounded. Could that be causing both problems? Also, any tips on how to test and see if the odometer gears are slipping? By the way - only 95k actual miles, so the odometer hasn't had that bad of a workout.

Forums