Changed all temp. Sensors but temp. Gauge says it's running hot but hit has no symptoms of overheating

If you have access to a diagnostic scan tool, hook it up and see if the engine coolant temp on the scanner matches the dash gauge reading. If they match, you have an engine overheat problem that yo u MUST address. If the scanner reads normal and the dash reads high, you PROBABLY have an instrumentation problem that you will need to troubleshoot.

You don't say when the car is getting hot, so it is difficult to surmise what the problem is. Often times running hot without overheating is related to an airflow problem across the radiator (fans inop, debris in the fins or between condenser / rad, missing air dam, etc).

Undo the clip on the highest hot hose to expell any trapped air(this is a first step to any heating problem and its the cheapest.....)