I would try tracing the turn signal wire behind the cluster and see if you can find any place where it burned, if you do some searches for posts with my name, you will find threads where someone told me what color the turn signal wires (I think one is blue with a grey stripe the other was similar, but I can't remember because it was months ago) are and yours may well be the same.

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2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car