When speedometer cables are installed, curves should be as gentle as possible. When curves are rather acute, they would cause restriction thus the jumping needle. Another thing to do is to pull the cable out and apply some grease to it before installation. Quite often cables comes with minimal grease and this does not provide a smooth turning motion.
At meter end, release the tightening a little and check if a grommet inside is missing. Overtightening can cause the cable to be too tight and seize the needle causing it to overshoot.
Hope the meter has not been damaged as it is spring loaded and overshooting can cause the spring to snap.
Friday, November 20th, 2009 AT 2:57 PM