Water Temp Gauge screwy behavior

[Cracksrubi]

I appreciate the diagram it will be help full my truck had those cheesy chrome gauges under the dash and I'm just sick of looking at them this is all that pulled up when I searched for it but had proved to be most helpful. My harness has many "additions" to it I'm just trying to make it safer, more stock looking and less prone to catching fire. All I need now is a temp sensor and a pig tail and I can handle it from here.
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