not a t-piece from the compressor housing just a barb fitting.
as for your gauge u can run it off any of the vac lines attached to the plenum just t-piece in.
dirty grubs.....
whats the issues u r facing with boost lines?
very basic too do.
compressor housing nipple put a vac line to waste-gate actuator.
running a boost gauge, run it from a nipple on the plenum chamber.