I have guage problems in my E30. The tach and temp guage are both dead. I am just going to buy another gauge cluster with a 7k tach insetad of a 5k and put it in my car. Here is the question: I have a motometer unit, are all the speedometers on the E30's the same or does a VDO have to go with a VDO cluster and visa-versa. Later.