Speedometer on a 1976 VW bus not working?

If the speedometer on a 1976 VW bus is not working, the issue could be due to a faulty speedometer cable, a malfunctioning speedometer head, or a problem with the drive gear. First, inspect the speedometer cable for breaks or disconnections and check if it spins when the vehicle is in motion. If the cable is intact, the speedometer head may need to be repaired or replaced. Additionally, verify that the drive gear in the transmission is functioning properly.