General Question About Pneumatics

[itsme]

My team wants to build a pneumatics system.
I need to know what connects to what and how it works.
From what I understand the compressor is connected to the spike that is connected by PWM to the relay port on the RC.
Another PWM is connected from the digital input port on the RC to the pressure switch. It gives 0 if pressure is 115 psi and 1 if its under that (correct me if I'm wrong).
There is a function in EasyC pro that's called Pressure Switch.
My question is: how do I do all the connections of the pneumatics and then use it with the function in EasyC Pro.
Sorry for the messed up question.

Thanks in advance,
Team 2217