Temp guage not reading correct??

My 72 340 also has a 180' thermostat. Gauge w/new sender shows about the same as yours. Temp gun shows mine at 180' also. I am going to replace mine with a 185' or possibly 190' but I don't think the higher one (190') will be needed.
Yote
Ok let me know if your guage changes when you do it please.