Hmm
BOV= SMIM YES
Gauge= Throttle Body instead, not sure if the intake manifold T idea will be a good enough source since its split...does the gauge hold full vaccum? If it does and your BOV operates fine then i assume its ok...
SMIM to MBC= NO Put one side of the MBC to the nipple located either on your Turbo's compressor housing itself or a nipple somewhere on your inter cooler piping (Ive never heard of people running it of the intake manifold...seems a little late in the circuit to me...but what do i know :P
MBC to WG= Yes...just make sure your get the right source going to the right inlet on your MBC else youll have a little bit to much boost
Fun way to figure out if its right or not get on it in second gear if she spikes you got it wrong ha (oh make sure to turn the controller all the way down)