Pneumatics Pressure Gauge on Dashboard

I would like to be able to display the pressure gauge on the dashboard so that the drivers know how much air we have in our system. I know how to create a gauge on the dashboard but how do I get the information, if possible.

If you want to know exactly how many psi of air there is in the system, you will need an analog pressure sensor/transducer plumbed into the pneumatic system on your robot. You cannot use the standard pressure switch used on most FRC robots, as it is just a digital switch that toggles on or off between when it drops below ~95psi and then above ~115psi.