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MP/GP IV is on the steering console behind the cluster (easiest to reach with pod & cluster out) and that's the main one for the cluster - There is also a ground connection distribution point - it connects to MP IV and also to cluster plugs: A, B & C (Brown wires) as well as other places- check that one for good connections - you should be able to follow the brown wires to find it.
I've experienced issues with the gauges reading incorrectly because of resistance in those grounds on my 88. I pulled the pod and cleaned the posts that power the volts, fuel, oil pressure, coolant terms. And that really helped the issues I was having with the fuel gauge (not reading full) and volts reading lower than what was measured at the CE panel.
Not exactly the bouncing issue you describe, but it could help
I'm pretending you can't see... but I still don't know! - my experience is mainly with Digi-Dash cars ~2 generations removed. We need someone with an OB dash apart to help out here.
To investigate all the connections I think it may need to come out again anyway . The good news is it gets quicker & easier every time you do it - the bad news is it gets old over & over too.
i HAD SAME ISSUE WITH TEMP gauge affected by turning lights on - ground issue. The blades in the connector hoods are quite soft, and it seems the act of touching them with a meter probe was enough to bend them - advice from here. I cleaned the blades, applied Deoxit, and retensioned them with a small right-angle probe (dental pick?), problem solved. IIRC there are 3 ground connectors in the right hand connector hood.
jp 83 Euro S AT 57k
07-14-2023, 08:41 PM
. The good news is it gets quicker & easier every time you do it - the bad news is it gets old over & over too.
