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Re: Weird temp gauge problem.
Welcome Clint!
I'm not sure if you will be able to easily see it by looking up from under the dash or not, but try to get a look at the instrument cluster plug to see if there is a dark green wire going to pin #5 or pin #6.
The reason I ask is because pin #6 leads to the temp gauge while pin #5 leads to the temp warning light.
Normally, in trucks with the factory gauge cluster, the pin #5 connection to the warning light was left unused and the dark green wire went to pin #6. But if a previous owner converted your truck from a warning light cluster to factory gauges they might have missed re-pinning that wire to the temp gauge.
Another thing you can do is look for a dark green wire (or two) connected to the ignition switch connector (that might be easier to see). A green wire or two there would indicate a truck (or at least wiring harness) that was originally configured for a warning light cluster.
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