Q: Temperature Gauge not working after Coolant system work

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I experienced an overheat while hauling a heavy load (13K) up a 6-7% grade. I wasn't sure whether it was the water pump or cooling fan. During this time, the heat stopped working on the truck. I replaced the tstat, water pump, fan, and temp sensor. Now I am not getting a reading on my dash temp sensor gauge. I check the sensor with multimeter and all is well. What am I missing here?

My car has 260000 miles.
My car has an automatic transmission.

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