[Dan]

Some liberty’s have the yellow valve too, it’s before the solenoid that supply’s air to the little plastic manifold when the key is on only , I took and put a line to join into the line that feeds the line to the plastic manifold, so if there was a failure with the solenoid I can open the valve and supply air to manifold then replace solenoid later

That yellow valve comes right off the Prevost Norgren filter

[Chip & Pam]

I didn’t want to confuse anyone more on this topic but all 3 of my dash air gauges work with the key in the off postion.

Different ages, different plumbing

Later

bv

[Archived]

Bernie it can be that way , it depends on which of the two plastic manifolds the aux gauge comes out of , if it’s the one that only has air when the key is on it won’t work , if it’s on the other one it will work it has air all the time key on or off