Maurader question plz?

Had the same problem with my Discovery and the pump. I always go with the one on the gun after i upgraded to a tank with a gauge they both match up so the gauges that they put on the rifles should be pretty reliable don't know so much about the pump. Also if you have a chorno-graph the .25 cal marauder should have a shot count of around 20 shots per fill so you could shoot it over the chrony and then see where it drops off which would then give you the answer. If you don't have a chrony i would just go with the gauge on the gun.
Leo : )