If you look closely at pin #4. it looks like the solder is cracked. I don't know right off what pin 4 is for but could cause a problem like you describe. I fix problems like this almost on a daily basis. The crack will usually be on pins that have a heavy unsupported cable (like the one for the cluster) attached or on joints which hold heavy parts (relays an such) to the board.
Paul

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84 500 SEL (307,xxx miles)