questions regarding <R73> [pneumatics rules]

[smcmahon]

We're using pneumatics for the FIRST time this year. We have what would be considered an OFF-board compressor. <R73> states:

<R73> If pneumatic components are used on the ROBOT, the pneumatic system on the ROBOT must contain as a minimum the following components, connected in accordance with this section.
A. Pressure gauges to display the “stored” and “working” air pressure (see Rule <R75>),
B. A pressure relief valve, calibrated and set to release at 125psi (see Rule <R76>),
C. A pressure switch, calibrated and connected to the ROBOT control system (see Rule <R77>),
D. An easily visible and accessible pressure vent valve to manually relieve the stored pressure
(see Rule <R78>).

[A.] We have a pressure gauge on our system, that will show what the current PSI is onboard. It's mounted inline after where the air initially comes in, and before everything else. Sound OK? With the regulator more than likely being OFF-board, then we'd need only one gauge on the robot I imagine.
[B.] We need to install this directly on the (OFF-board) compressor.
[C.] We do not have this. It seems, to me, that there is no use for it since we have no ON-board compressor. But the rule states we need it, as a minimum. So? What would it get hooked up to? We're confused.
[D.] We have this on the robot, right where the main air comes in. If I understand correctly, we need another one on the other end, coming out of the compressor? <R78>