The factory temp gauge needle reads way over to the L most of the time on my 85 4bbl. I hooked up a mechanical gauge and it barely went to 180 degrees on a humid 80 degree evening. So what could be the issue with the gauge? I replaced the sending unit in the intake with a new Motorcraft part and the gauge reads the same as before. IVR? All other gauges read good though. Is there a way to test gauge or adjust needle to correct it?
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