My Daystate MK3 has no air pressure gauges. I just fill it to the desired air pressure according to the guage on my air tank and shoot 40-50shots. Works great, no concerns, no fuss, most accurate a dependable rifle I've owned.
Been considering doing the same with my Mrod. But my old Audrius shorty Reg stills works to good to justify changing it out for the longer version...someday.
"It doesn't get done til someone does it"