[PGSigns]

Buy a real gauge and put it on the truck. That is the only way you will know what it is doing. A thermostat that is a 160 will open sooner and let the engine run a little cooler it will stay open fully and never close down when the engine gets up to temp and under load. A 180 will open later and may close down some to keep it at 180 if the temps out side are a little cooler and may run 190 under load. In the winter when the air is cold and there is no problem getting rid of the heat they may run closer to the number on the thermostat. A 180 will keep the water in the engine longer and keep your toes warmer. My truck has a 180 in it and on a hot humid day runs as much as 195 in traffic. Hard to get rid of the heat. I the winter runs about 185 and that is about all you could hope for. You pics are right about what I would expect.
Jimmy