Boost/ Vacum gauge..??

OK guys how the hell do you install the vacum line on the Boost/ Vacum gauge..?? The reason I ask, since the recent new engine, my vacum pressure has been sucking A** lately, and since i had the gauge lying around, im installing now...were can I run the vacum line from and to the gauge..??

I know this tech ..kinda... but there is more traffic here..SORRY ADMIN GODS

sweet, wasnt sure if there was a certain one I had to tap..thanks !

Does anyone have any pics of wich line they used...just curious to see the setup