I just bought this 1990 V8 Quattro. The odometer is not working, but the tach is. The V8 Quattro must be rare because it's hard to find much info on them. I found something about plastic gears breaking, so I wanted to remove the cluster and take a look. I really don't know where to start. I know I should disconnect the battery if I have to remove the wheel. But after that, I need help!