Temp gauge not working not over heating

Temp gauge not working not over heating 00 f150 4x4 4.2 xl I have repl. Cht sensor twice temp gauge stays below the c it idles high when first starts check engine light came back on this has just start a couple of days ago everything was working fine until then any ideas
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mcgyver89 [Entry]

Similar prob: 94 toyota truck my gauge says cold. Idle high at stop lites. It was overheating and took therma out. Drove no thermastate gauge reads cold. Put in new thermas and gauge is cold. Any suggestions? Too old for autozone free test. No check engine lite on. No overheating. No smoke or steam.