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My 1988 740 wagon with 201,000 miles on it does the same thing. Almost every morning I have to tap it. Then it is good thru the day. Not that big of a deal to do and I've been having to do so just about every morning for over a year now. I do actually have a spare dash with a temp gauge in it. Was just recently thinking of replacing "bad" temp gauge one with spare one. However if oiling it works then I would try that. Please post back on what you end up doing and how it works out. Thanks.
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' 88 740GLE auto wagon nearly 195,000 and ' 87 240DL auto sedan nearly 135,000
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