Take it out, blow through the intake port and either unscrew it's adjuster valve or screw it in. When you can blow through it freeely, it is set for minimum boost.
Then blow through it and SLOWLY turn the adjuster in the other direction from until it starts to restrict the air going through it.
Mount it in this position, watch the pressure readings, and try to set it where it gives no higher than 14 and around 9 on the low side.
Try this before giving up on the project...
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