When is coolant temp too hot. About 216

Thanks for the information. I'm wondering if the placement of the sending unit varies the reading. The reason I ask this is because the stock and the other gauge I tried read about the same, as the one I have it now. I put all three sending units in the same 3/8 npt hole. This is on the passenger side front of the intake. Eddy 2176. I did some more checking today with the infrared tempreture gun. Either the gun is off or the placement of the sending unit is possibly in a "hot spot" on the intake. I read between 185-195 around the intake and radiator. Any thoughts? Thanks Craig