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If it's not either of the two suggestions, I would say it's in the instrument cluster itself. I had a similar problem in my 1991 744 (essentially a 940) where a couple of the lights would come on (upshift and something else) when it was cold. Finally got sick of it, yanked the instrument cluster (surprisingly easy, check the FAQ), resoldered the whole thing and tightened the screws. Problem solved and it still works! I would try this after trying the other suggestions, as it is quite a bit of work. And rather scary.
-Greg
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