check your hoses, and connections on the back drivers side of the engine, thats where the problem ussually is, if nothins disconnected , i take it that your complaining about an after market guage , pull it out and check for the connections, it depends alot, thats basically all up to you lookin really hard , or take it to a shop, the venting stuff, get an hks vpc, that will allow you to vent, wel vent with no problems at least, and it might seen faster, but actully its slower,someone did dyno runs on dsmtalk on this topic, and it makes the car lose power.
laters
dave