I use one of these for my cab suspension fed from the same port after the protection valve as the original that was run over to the manifold valve. Push to inflate the cab suspension, pull to deflate thru that sintered bronze filter.
The hydraulic manifold has 2 separate air inputs, one for AOP and the other for cab suspension…
you will also have to follow the other air line from the manifold that is used for the AOP. It most likley runs back to the rear axle to a remote control valve that is connected into park air. If park air is applied(brakes released) it disables air to the AOP so you cannot tip the cab while driving…

on the 1078 A0 they put that remote valve on the service tanks as it samples pri/sec air from the tanks. I did a video removing that valve from my tanks, it is the same basic process removing it from over the axles, simply follow all its lines back and cap them at their sources…
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