I have a 1979 320i with 100k miles. Recently the odometer and trip odometer stopped working. The speed indicator still works fine so the cable must be OK. Do I need to purchase complete speedometer unit or can it be repaired? David Torrey Bangor, Me. 1993 Audi 100 CSQW 1988 Honda Civic Wagon 4X4 1979 BMW 320I