From searching the forum it seems like most folks say to tap the brake booster line and install a vacuum manifold and then tap into that. You would then be able to run your BPV to the manifold as well, giving your wastegate actuator its very own hose to the manifold. I don't know if this is more accurate than tapping into the same hose as the BPV and the WGA are already on.
Here's the manifold I installed on my ride last week. Works bosco!