Temp & fuel gauges - what am I overlooking?

Uncle Bob said

It's got that factory red stuff on it.

I used the old temp sending unit and a heat gun to confirm the temp and fuel gagues and the cluster itself isn't the problem. I could keep looking forever, or I could accept it's not in the cluster and put it back in. So I'm in the process of reinstalling it.

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Just for the heck of it, after the cluster is back in, use a clip jumper from the brass body of the temp sending unit to the battery NEG, or to an absolutely known good body ground. Let's see what happens. I was in Elevator technician for 43 years. Hopefully your gauge will go high and low, not up and down. LOL Keep us posted.