personally i'd get a AKALMP Sidewinder, just about as consistant as you can get (i'm +/- 1!! over the chrony, but that is on a Merlin as well). . . . but they have numerous plus point, firstly they work fine with CO2 as well as air (work happily with preset tanks), they were designed for Low Presure (i.e sub 200 psi) but are just as good at higher pressure and also the air input bit is at the bottom and rotates so you never have a problem with it being in the way!