[TubaMorg]

It is perfectly legal to do as you describe: compressor, 2 gages (120 psi, 60psi), and relief valve and pressure switch are all you are required to have. Some suggestions, though. While the compressor is able to increase system pressure to 120 psi, it is not designed to move a whole bunch of air quickly (mass flow rate). This means that the compressor probably can't keep up with the air demands of ONE venturi and much less likely to keep up with TWO. Also consider using lower air pressure to supply the venturi as the spec sheet says optimum air supply is about 26 psi.

Good luck!