Hi Jon, on my 87 the levelling system didn't seem to work unless the air regulator was turned up for the tag, on mine there is two guages at the back, the lower one is main air and the upper one is your tag and levelling air. Hidden behind that is a regulator so you can ajust how much air is getting to the tag etc, I have mine set to about 40psi and all the levelling etc works. Hope this helps!!
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Keith, Krista and Family
77 38' Newell Coach Repowered from Smokin' V555TA To 325hp 8.3 inline 6 cummins, Allison 3000 series trans
87 40' Newell Coach 475hp 8V92 DD(sold)
22' 350hp Jet Riverboat
79 Ford F250 4x4
Many others to list
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