Radiator question

So I took the Dart out to a car show last night. On the way to the show the car ran well the needle didn't get to the extreme hot side of the gauge. Coming home with lights on the gauge stayed in the normal range, so now I'm thinking it is the gauge. I shot the usual spots when I arrived at the car with my temp gun and at the stat housing 164 the top of rad 194 the bottom of the rad 136 safe to say the car doesn't have a temp problem, thanks to all who read and responded....