Sounds to me like you may be applying some old school ALH era thinking to what is a VERY different engine.
Besides, you can watch boost (if for whatever reason you like to see that sort of thing) via the DLC with a suitable tool. It is in the data, no special anything required.
If you want to tap into the charge air tract somewhere, for an actual ancient style boost gauge, it would be probably easiest to just remove one of the various plastic pipes and install a nipple in that. Could probably go after one near the bellhousing area or down low in one of the tubes that goes in and out of the charge air cooler.