Ok, so I found that if I maually ground the case of the instrument cluster, everything works like it should. Does this make sense? Is the case of the cluster supposed to be grounded somewhere? How so?

Thanks!
PS. It seems that this is not shown on the wire diagram, or am I missing something?

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Feelstranger
My Wheels
1991 Audi 200 20V Avant
1991 VW Westfalia Syncro/Audi I5
1983 Mercedes 300D turbo
1972 Kawasaki H1 500 Mach III
1970's Limongi/Campy road racing bike
1942 Old Town sailing canoe