the mbc should go between your wg and boost/vac line off the turbo. Some run it off the vac line at the intake but you'll get a slower response. Not sure if the factory controller needs to be connected still for monitoring/metering purposes, someone else will have to chime in on that one.
On the HPmbc, it should have two adjustments, a high, and a low setting. Adjust the high setting first to get you near the boost you're looking for, then use the low to dial it in presicely (the high setting will adjust from wg spring pressure onward, the low setting can only adjust within a window of +/- 1-2 psi of the high setting)
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