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I found on mine the plug in module which is part of the instrument cluster fails. The ic chip goes faulty. You can take the yellow wire from the circular harness that drives this module and rewire it directly to the guage by splicing a round wire end ring and loosening the bottom nut of the temp guage and connecting it there. Drove me nuts for a long time, sometimes it would work sometimes not. Only difference is the temp gauge runs a little lower reading but still shows you a proper temp reading all the time. Before the mod it would go up and down while driving, which would drive you insane.
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