I have the factory gauge and the fan sensor and since I started having the problem I carry my digital therm I use on several different applications and it is showing the same as the gauge and I've had the truck fo several yrs and I can tell when it is hot just from the reaction of the tbi the engine will run differently. And it will never overheat under any circumstances if the a/c isn't on. Thanks for your thoughts though cause I'm not past being absent minded and forgetting to check the basics and the small things. I'm 60 and been stupid 55 of those lol