Running the high capacity tires I am (4080lbs per tire), I typically run just 40-50PSI in them empty and 50-60PSI loaded.
The idiots @ Ford set the factory TPMS lower limits to something stupid like 70PSI
No way Im running those pressures without a kidney belt
So Ive turned it off, and run a cheap chinese made valve cap TPMS setup.
This one.... works great, and also shows tire temp which is real handy as well for hauling heavy.
Shown in bars and Celsius, but can be switched over to PSI and Fahrenheit.
Recharged by solar, auto-dims when dark, and just sticks to the inside of the windshield.