Might try to get a factory build sheet from Germany to see if it gives more info on the cluster. I think Jim B. knows how to get the build sheets. do a search for it here in the forum. Good luck. At least it is working now so you can drive it until you figure out the solution...

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red