Thats how you do it, scale at the truck stop, see your axle weights, and compare to the psi showing on the guage. mine is 60 on the tractor and 80 on the trailer. Or, ask your company, they may know what readings you should look for on that truck
However you need to realease the brakes, and or/move some to get a good reading. and you must have full air pressure as well. Some of the more expensive ones, give you actual numbers, the others show a pressure, and are not dead on everytime, but are good to get a rough idea
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