Tach and Economy gauge do not work.


#1

Hi all,
Hopefully somebody can help me.
After doing my interior my tach and economy gauges do not work. They worked before I started. There was one single wire to the cluster that I did not reconnect because I could not remember where it went. I do not know if I missed plugging in a connector or accidentally cut a wire.
I have an 89 325is.
Bentley is not very good for wiring.
Anybody have any ideas.


#2

See http://wedophones.com/BMWManualsLead.htm for the factory wiring diagrams.

On this car the tach and econometer signals are routed through C101 to the right most connector to the cluster. A failure of either fuse that powers the cluster or a failed SI board can kill the tach and econometer. So the connections and the SI board would be my first suspects.