I just got 2 different digital guages. One from topgun and one from huma. The topgun is for my second reg pressure and the huma is for the bottle pressure. The problem is the topgun guage is reading 4.770 bar and the huma is reading 0.000 bar... can anyone tell me what the issue is with these guages? Both are brand new and have fresh batteries and i know for an absolute fact there is air in the gun and the reg is set to 1305-140 based on the analog guage.