Pneumatics: Pressure Regulation, How to?

hey guy's, so I'm working in a tight space and need to regulate pressure across multiple leads using my Arduino Uno. Anybody able to point me in the direction of making this happen? Or is it time to go back to the drawing board?

i dont understand what you are trying to do

Show us what you have on your drawing board so far.

Pneumatics have mechanical regulators readily available, why use electronics? Do you need to be able to vary the pressure remotely?