cruiser,
It seems to me that a dual connection on the PG fitting would be a lot easier and should work well. I vaguely remember that PG operates by vacumn. After all, you won't be using the brakes and PG at the same time. Neither uses much vacumn (Volume)
If you choose to tap, put heavy grease on the drill bit and tap, the grease will catch most of the chips. After that I would try a shop vac to clean out the remaining chips, but the best way is to remove the carb and put a small suction tube inside the intake to get everything.
