[MrForbes]

That is correct. You have the compressor, pressure switch, tanks, relief valve, high side pressure gage, and manual release valve all connected together before the regulator. This part of the system is at 120 psi maximum.

After the regulator, you have the second pressure gage, the solenoid valves, and the pneumatic cylinders (and the second pressure regulator if you so desire). This part of the system is at 60 psi maximum.