[77newell]

If you close the two valves that Steve showed you can monitor the pressure in two of the systems by checking the pressure loss shown on the dash gauge (which gets its pressure from the front distribution block) and the pressure gauge at the rear six-pack (shows pressure at both six-packs). It would be handy to have a pressure gauge added from the rear distribution block so that then all parts of the system could be separately monitored. As it stands now if you close both valves you have no way to see what is happening with the service tank and rear distribution block since they are isolated from both installed gauges. There are available ports on the rear distribution block to tap for this added gauge.

I never did figure out on my coach where the 1/4" black line going forward ends that Steve shows on his diagram.

The other curiosity with this system is why there is a drier prior to the rear six-pack but not for the front six-pack.

One other detail on my 93 coach that differs from Steve's drawing is that my rear HCVs are fed from the rear six-pack on the port opposite and in line with the air supply line.