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the piston pulls on plenum. Any hole, anywhere, from the plenum source, is good for blow off valve, fuel regulator, boost controller/gauge.
If you had an external gate you would want it to receive pressure from a NONvacuum source, such as the pipe before the throttle body. The throttle body HAS one of these ports in it; indeed if you check with your finger/mouth on a running engine you will find that 1 of the throttle body ports has no vacuum with the engine running. If you slightly open the throttle body suddenly it has vacuum a little bit. This is due to it's proximity. Once you've identified this port you should leave it be, cap it, don't bother with it. Use the other ports which lead directly into the plenum.
Any other port. You can drill a new port and thread a npt 1/4" nipple in the plenum if you want. Or use the ports in the back. Only thing you don't wana do is T them, don't make a bunch of T's from one port, or use any LONG runs of hose. It will weaken and delay the signal. For best signal/response from devices (BOOST CONTROLLER) you want a SOLE dedicated vacuum line, a NICE LARGE one.
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