My sensors are very close to accurate. I run 41 psi front and 36 rear on my 24 Badlands with a 2.7L engine. I have the rear seats removed but have a lightweight platform and shelving to replace them. Pressures determined by chalk like test. I am due for my next tire rotation and treads are wearing perfectly. I get no harsh ride on pavement and air down off-road.
Remember, if you split an innertube after taking a sweet jump, then your pressure was too low. If you split a dried-up old sidewall after pumping up by really leaning on the pump handle, then your pressure was too high.
Oh, back to Broncos --
my SAS OEM seems to like 38 - 40 on road.
Haven't been below 18 off road, but probably should've once or twice.