Found my dads original 1971 duster!

dads71 said
Hey. Thanks for the message. I measured all temps at the exact same spot every time, every 5 minutes. I only added the pictures and information of the factory temp gauge so that I could show where its needle was at while the readings on the engine were taken. Just did the best I could do, with what I have

I agree. I wish I had a screw in gauge to replace the temp probe in the engine for now. I’m having a hard time finding one with a short enough probe portion and proper threads. It’s hard when I’m not sure what I’m after too

Oh hey, dont get me wrong, I wasnt criticizing! You are doing a terrific job of dealing with this colossal undertaking. All I was doing is offering a suggestion as to what would give you the most reliable temp readings to make diagnosing easier for you. Maybe I missed the part about not being able to find a sending unit, why is that giving you grief, is there something different about your intake manifold? My Autometer came with a sending unit that threaded right in, no fuss at all.