Hi all I have been having difficulty with my speedometer. The unit is one of the pot- metal early tr3 units. The odometer reads erratic and will jump hundreds of miles at a time. I took it apart and discovered that the little gear teeth that fit on the brass worm gear looking thing are ground off about a third of the way. I figured that the trip dial and the odometer were perhaps binding up and causing drag in the unit and damaging the teeth. Does anyone know if those little gears are available somewhere. I left the trip odometer alone as a unit but took the main odometer apart. I found this to be quit an interesting challenge because the main odometer unit looks like it needs to stay on the main body right next to the hair wire that drives the needle. One question I have is how freely do odometers move? I can advance the system by moving the ring gear with my fingers, but it feels like it has too much drag on it to be driven by those nonmetal gears. And can I randomly re-assemble the unit and then advance the mileage by lifting up the twang thingies. Anyway my plan is to oil the units up and find some new, I guess bake light gears, and then see what happens.