My coach 303 seems to only have an up or a down on the dash instrument panel for the tag. I have found the valve with the air pressure set on the curb side of the engine compartment. When I had it weighed at the Newell Rally in Anacortes, the weight distribution had the Newell folks set my psi at 50. So, I'm guessing, that the best way to determine what the psi should be is based on weight of all the axles? I have to leave the tag switch on my dash in the down position otherwise the red tag light comes on and chimes. This seems to be a warning system that I should not drive without correcting the tag switch position back to the bottom.
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