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With the pump pushing fuel past the nitrous jet into the plastic gas catch can, we adjusted the pressure to what Greg wanted, a safe 6 1/2 psi. We experimented with the regulator and noted that half a turn on the regulator was worth a 1/2-pound change in pressure. We discovered that the tiny gauge mounted on the regulator wasn't accurate. Our Winters gauge registered 6.5 psi when the little gauge read about 8 1/4 psi. That's a 27 percent difference on the lean side. We also measured the static, nonflowing pressure at 8 psi.