Outer Limits 4x4 Board

Been some discussions elsewhere on fitting temp gauges to autos.
Looking to do the same but how hot is too hot ?

As the standard oil temp gauge is for the engine oil, am wondering just what temperature does an auto normally run and more importantly, whats the high limit ?

I'm not certain that the auto brand matters, thought it would be more the ATF thats the issue but just in case its an AW4 which uses Dextron III

Normal running temperature is around the 75-85 deg mark.
With twin coolers mine sits around the 55-60 deg mark.

I have had the temp up to 120 deg once or twice. As long as it isn't for a prolonged time it should be ok.
If the temps have gotten up into the higher range, check your oil. If it's smelling a bit burnt, get the oil changed.