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#2
05-30-2014, 01:08 AM
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Another possible cause would be a bad ground connection or connections. There have recently been several discussions about bad grounds in various circuits around our cars.
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1961 190Db retired 1968 220D/8 325,000 1983 300D 164,150 
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#4
05-30-2014, 01:46 AM
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That scenario is possible, but the ground system has many connection points. Some of these involve wires, and others involve the so called PC boards of the instrument panel. Any or all of the connections can be bad with varying results.
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1961 190Db retired 1968 220D/8 325,000 1983 300D 164,150
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#6
05-30-2014, 08:50 AM
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Since all the connections (except the clock and tach) go into the left pod, you can just plug the pod back into the car connector to test it without the rest of the cluster present.
Goes without saying, don't crank the car with the oil line disconnected  I think you have a bad replacement gauge. I would try jumping out the rheostat. Get a set of alligator clip leads from Radio Shack, I would run 2 in parallel since there are a lot of bulbs on a 123 that run through there. I have a spare 123 F-O-T gauge available. It is from a pre-1981 123 since the units are American (psi and deg F). But it is electrically the same. PM me if you are interested. If you are really adventurous you can remove the needles and swap the faces if you want to retain the stock look. One other thing that won't be there is the startup bulb self test for the low fuel indicator, that was added on the post 81 units.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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