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The 10mm nut is a locknut. You loosen this, then adjust the center shaft with an Allen (hex) wrench. Screw it in (CW) to increase boost. Try a half to one turn at a time, them re-test boost pressure. 14psi is a good target. Don't expect a big power gain, my car had zero power gain from 10 to 15 psi. Adjusting the ALDA may not work, as the real fuel limit may be the full-load fuel setting internal to the IP (rack stop setscrew). That requires pulling the IP out to adjust - not fun.
Good luck,
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