installed an awe center vent boost gauge. the bailey bpv came, too, but i didn't get a chance to install it. the gauge has a bit of chatter at 5 and 15 psi, even with the filter installed that came with it. todd from awe said the gauge should not make any noise, so he sent me a new gauge to test. it, too, made noise, so i could return the gauge, upgrade to an electric one, or just live with the noise. for now i'm just going to deal with the noise.