First time using a ext WG so does it just get it's vacuum source like the same as an int wg? Straight from the compressor housing or just tap a vacuum line? Also what is the hole on the top of the WG for? Do I just leave this open or plug it? Also I'm using a Turbonetics delta"death"gate wastegate that I got for 25 bucks. I couldn't pass it up for that price.