Changed speedometer cable, still jumping

the only moving part of a pure speedo minus the cable is the magnet rotor and the eddy current cup with a light hairspring that acts to keep the needle on 0. Lubrication would be limited to the cable receiver, eddy current cup bearing and the magnetic disk bearing. The odometer may benefit from a very light oil on the screw gear but as these are usually made of a very hard nylon, they would not need any normal maintenance.