Hi,
I have a E34 520ise 1990.
Recently the MPG Gauge has stopped working. Everything else on the instrument cluster (speedo, gauges etc) are working fine.
I can't seem to find what exactly sends a signal to the MPG gauge?
Can anyone help??
The MPG gauge twitches when I turn off the car so I'm guessing it's not the gauge that's dead but whatever it is that sends the signal.
I heard that if the SI backup batteries in the instrument cluster are dead this can cause problems but I've checked those and they're fine.
Can anyone give me a clue as to what controls the MPG gauge??

Any help much appreciated,

Thanks

Mike.