FX Plenum gauge for FX DRS Pro

My DRS Pro arrived (yay!), but it doesn't have a gauge on the plenum. I assumed one would come with it. I've seen people using a digital gauge that plugs into the holes on the side of the plenum for easy monitoring, while behind the rifle. Does anyone know what that gauge is?

You will need a angled manometer bracket and a gauge

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I ordered some gauges for it.
Do I need to depressurize the system to attach something like that? I didn't see anything about that in the manual.

Lastly, are these things safe to dry fire? If so, should I dry fire it with gas or without? I plan to use mine for competitive shooting, so I'd like to practice with props and small targets, using my DFAT scope adapter.
 
I ordered some gauges for it.
Do I need to depressurize the system to attach something like that? I didn't see anything about that in the manual.

Lastly, are these things safe to dry fire? If so, should I dry fire it with gas or without? I plan to use mine for competitive shooting, so I'd like to practice with props and small targets, using my DFAT scope adapter.
Yes, slowly loosen the small set on the side of plenum to degas your rifle. You need to leave it out when you install the angled manometer bracket.
It is ok to dryfire BUT never without air !
I wouldn't dry fire a lot though.