I have the cluster apart. Odometer; the small black gear on the end of the metal shaft that comes from the motor(?) and the large black one it drives both have broken teeth. It seems removal of 2 small phillips screws will allow removal of the clear plastic housing and replacement of these gears. Is that how it goes? What kind of grease is on these gears? Clock; When setting the clock, the bevel gear does not disengage from the clock gear when the knob is released. The whole setting mechanism is very sticky and does not work smoothly. I am hoping that is what is wrong with the clock. I don't think I want to tackle taking the clock/tach unit apart. I am going to hook it up to 12 volts and let it run for a few days whilst I am otherwise occupied.
Thanks,
Harold