I actually have a fuel pressure regulator installed that's left over from having the old holley blue. It's set on 7.5-8 right now, and I notice when it's just sitting still idling in park, I can rev the engine, and the guage will drop down to 4 or 5 psi. The needle never goes past 8psi. The 9-10 psi rating on the autozone fuel pump is highly optimistic I assume.