How do you repair 88 BMW 325is odometer not working?

To repair the odometer on an '88 BMW 325is, start by checking the speedometer cable for any damage or disconnection, as a faulty cable can prevent the odometer from functioning. If the cable is intact, remove the instrument cluster to inspect the odometer gears for wear or breakage; you may need to replace them. Additionally, ensure that the connections to the circuit board are secure and free from corrosion. If the issue persists, consider consulting a professional or replacing the entire instrument cluster.