So I'm wondering if I'm doing something wrong, Ive been through 5 speedometers and not a single one of them has a working odometer. we've gotten quite good at setting the replacement odometer to the actual mileage on the car, but then we install it and it does not work. All the speedos work fine, but not one of the odo's is working. Anyone have any suggestions? Is there some tamper proof setup we missed? Its getting quite frustrating, and expensive!