I have had this 2nd Hand M3 for a little bit now. BOTH 1st and 2nd Regs read the same psi. I wanted to set the 1st Reg to 150, but when I did, the 2nd Reg also read 150. Wierd? I thought so. Took bottle off to degas system, and it bled ALL the air. Didn't think anything of it and proceeded to...