My Jetta odometer had gone south when a previous owner had pressed the trip reset at about 232,000 miles. He drove another 7000 and I drove 17,000 further. He figured that he had broken something like a gear.
I keep track of my mileage and was plain tired of looking up everyplace and figuring out the mileage.
About a month ago I asked here, looking for a new one which lead me to a new used one and I also got some repair techniques for which I was grateful. I was planning on doing a repair but tore the plastic circuit board.
My car is running well now, the "new" speedometer is in metric which is ok It seems to work and the gauges work.
I decided to tear into the speedo unit and see which gear I had broken. It turns out no gears were broken but the cast metal gear on the central shaft which is normally press fit was turning on the shaft. I knurled the gear bushing with a dental pick to create an interference fit to the shaft and fit it back together. As a bonus I reset the odometer to 0000000. At present I am not planning on changing it back out but will have it when the other starts acting up.