I have done these a bunch of times. The only real way to set boost on these is by driving the car and then adjusting to fine tune boost setting.
Start by turning the wastegate adjustment so that it keeps the flapper closed with slight tension. This will be the lowest boost setting. If you want more boost turn the adjustment so there is more tension holding the flapper seated.
BTW try to keep boost at 10 lbs on a stock I/C, any more and your pushing it. Also, get a nismo FPR and a fuel pressure gauge and bump the F/P up 5psi.
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