legacycentral bbs

i replaced all the vacuum lines and when boosting my gauge now only bounces roughly 7-9 psi, it used to be 5-10 psi.
now if my bypass valve was leaking, could that cause my needle to shake. i know i am using a psi ga. from work and it's probably pretty cheap but if it's accurate, what else could it be. i suspect this could also make me run a little rich if it's leaking?

Correct, check it out, Replace the hoses and clamp them down, Or is the physical BPV leaking?

physically.