Michael,

Let's assume Bryan is correct. If he is you have a gauge issue. But what if you do not have a gauge issue?

If your gauge is reasonably accurate, and by that I mean within 10 degrees, you still have a serious problem which is going to cost you a whole lot more than an IR gun, and 5 to 10 times the cost of a recored radiator if you continue to be in denial. You need to see temps in the 180 to 185 degree range and you are so far above that range with running on flat roads something is wrong.

Don't trust your DDEC to save your engine. It might, but if your temps are really as high as your gauge shows it is now the only and last chance you have to save your engine. Do we have your attention?

When you tell a patient they have a terminal disease don't they go through a period of denial? Does that period of denial change the outcome?