where to tap compressor housing gtx turbo
 

I was wondering where is the ideal place to tap or does it matter ..im going to run vac line str8 to the wastgate .sorry for newbie ? Just wanna make sure before i start drilling

There is a flat spot near the outlet of the compressor housing. This is where Garrett intends for you to tap into for a consistent boost (pressure) source. Drill, tap and install a 90 degree fitting pointing down towards the wastegate