Reply to "Speedometer bouncing"

Speedo cables run inside a steel housing with a poly liner between the two. If a speedo needle starts jumping, its almost always because the rotating inner cable has worn through the plastic liner and is catching on the worn liner edges. No known lube will permanently cure this problem. Normally the cable continues to catch until it finally breaks. You should replace the entire assembly since the liner cannot be removed and a new inner cable simply catches and breaks on the same worn area in old housings. Re-routing for shallower bends minimizes liner wear, and tight bends increases it. New assemblies are teflon lined which helps the wear problem a little.