Does the Norgren Pressure Regulator show working pressure or stored pressure?

[TubaMorg]

If you look at the regulator you will see an arrow. Upstream is 120# while downstream is your regulated pressure. A pressure gage can be added to one of the other ports to provide indicated working air pressure. You are correct that another gage upstream of the regulator will provide indication of system pressure.

For off board compression, use a manual relief valve with an open tubing connector on one end (goes to compressor) and the other end connected to the accumalators (either directly or via more tubing). You may want to add a T with another valve so that you can vent pressure between the isolation valve and the compressor to disconnect the jumper tubing.

Good to go?