This is a random place to install it, but I've found that it works quite well. I also have discovered after trial and error, there really is no Vacuum, or a line for vacuum/boost. The highest I have seen so far is roughly 19.5psi under full throttle and a spike to 20+ every now and then, and a rough average between 13-16psi under normal conditions i.e.- acceleration, lane changing, highway lane changes, up hill acceleration etc etc.
as as for where I have tapped into, I used a small hole that seems to be either a pre-drilled hole, or just a small hole that is, I guess you could say recessed in the intercooler pipe just after the 90 degree bend attached to the throttle body. And so far it has been proven to be accurate, or more accurate than the previous picture I posted with the 2nd suitable hose to tap into.