Hope you have better luck than me. I think I was running with a stuck open thermostat for years. On the stock gauge , always ran low.
Then after a major tune up. Started running on the Hot side.
I have replaced everything except for the water pump. ( 197 deg Thermostat, Clutch fan, the fan, 3 core radiator, Air deflector, All coolant hoses, Gauge sensor)
Now she runs about half way on the stock gauge. Still seems a little warm. (the Intake gets pretty hot)
Anyways. I have a Motorcraft 180 thermostat to install).
Then I am going to replace water pump , since it is the only thing left. Maybe it is getting a little weak. Not leaking though from the weep hole. there is a little movement in the bearing. not much