All my guages work other than the mpg guage. It's stuck on 30mpg. Is there a fuse or something to check to see if connected? I've read some say its vacuum related and others say it's electrical. Thanks guys!
On EFI cars, the fuel consumption is typically calculated from the injector pulse duration.
There should be no manifold vacuum involved.
Disclosure -- I am yet to see/learn how MB does it on the w140.
I'm not sure about how '95 instrument cluster is. I know that the later version is different. My '99 has only electrical connections to the instrument cluster.
There is a test function in HHTWIN for the instrument cluster to test function of all the gauges that runs all from 0 to full scale over a few seconds time span. If that is same for '95, then that would be a place to start as it tells you if gauge works, then you trace 'upstream' from there towards whatever drives the gauge.
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