Temp gaugue went out a while back. never had a overheating problem so didn't worry about it. Engine light went on a couple days ago because the thermostat threw a code. Immediately replaced the thermostat, Engine Cooling Tempature (ECT) Sensor, and flushed cooling system . All is good except Temp gauge on instrument panel still doesn't work. What else can be faulting the engine temp gauge on the instrument cluster when all other gauges are working and no under/overheating problems with engine?