Does anyone know what the regulator is at the back drivers side of the intake thet has a thin vacuum hose going to the top of it? And can you explain why it doesn't seem to have any vacuum pressure with it? I tried to tap into it for my boost/vacuum gauge, but got no results. just looking for some help.

 

That's the AIR system valve. The vacuum signal to it is controlled by a solenoid that's mounted on the manifold just infront of the valve. Your getting no vac/boost signal because most of the time that solenoid is closed. You'll either have to tap into the feed to the solenoid or a different location if you want a goof boost reference.