I do feel like I have to watch the gauge too much. I haven't taken it to Cat yet to have them look over it (or have them plug it in).
The engine is remanufactured and I had to have a new head gasket put on a while back and things have been relatively good. No bubbles in the coolant (I put the good stuff in) and it uses none. But before all of that I repalced the water pump, thermostat, temperature sensor, the sensor by the AC dryer, tensioner pulley, new belts, radiator (fill tank) cap, etc.
I keep the radiator, CAC, AC condenser all cleaned out.
I try to take pretty good care of things......
BUT.......that switch is on the dash for a reason