I had (have) the same problem in a '88 560SL... refer you to my post titled instrument problems...

I think you are on the right track. I replaced a few fuses, and my problem mostly went away. Now on rare occasions, it will re-surface. Generally, a light thump on the dash pad rights everything...

I have been told loose or faulty grounds can also cause intresting problems...

Let me know how you fare in your repair of this item please...
Thanks

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