Gauge reads hot, but engine not overheating.

I thought my galant was over heating so i replaced the thermostat in it. It still read hot so i replaced the little one prong sensor and the cooling temp sensor. Still reads hot. Took it to local machanic who plugged it in a scan tool and told me it was not running hot. Computer shows proper running temps. Said my cluster was defected. I replaced my cluster and it still reads hot. Please help me im at a loss as to what it could be besides a wire. I think its the red and black wire if so i traced it as fsr as i could with out tearing out the whole harness and tore out dash and it looks fine. Am i looking at the correct wire?

Can you take a picture of what the overheating on the gauge looks like? Is it going to the red area, or just higher than half?

Take a look at this -
https://www.thegalantcenter.org/show...on-(explained)

My car runs hot at times too. I have an ultraguage that tells me that the temps are around 210 maximum, so I rely on that.