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The gage is a tattle tail after the fact. It is an output from the pcm not an input. Whatever it reads does not affect the way it runs. You might check the readings from the temp sensor at the pcm to verify the harness.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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