Well TBH i dont really use the bottle / pipe gauge, i shoot tethered to a 12 L bottle so i always have that pressure on the fill kit gauge.
If their rifle configuration would allow for it, i would select no pressure gauge there to save a few USD, or have a better gauge for the regulated pressure.
I could of course also some times need to shoot away from the bench and the 12 L bottle, but then i would just go by the known shot count, which i also assume is what people pestling at night do as they cant well turn off their light to read the gauge.
Mind you i just got a new watch, and OMG the lumen on it are bad ass, 5 hours after going to bed i have no problem seeing the time on the watch in the pitch black bedroom, the glow never seem to go away.
And pumping the phosphorus or what ever it is with my Led light, and at least for a few minutes after doing that i can almost use the watch as a low powered flashlight.
If they had lume like that on pressure gauges, and i was a night shooter, i would so get a gauge like that.