Stupid question:

Just hooked up an Autometer mechanical fuel pressure gauge to my fuel rail (used an NOS fitting instead of the Autometer which broke before...NOS has much better fit/finish). Anyways, I adjust the Kirban FPR to read 39psi without vacuum. When I put vacuum to it, it drops to 31psi. I'm assuming this is normal, right? Unfortunately I don't have an in cockpit fuel pressure gauge, so I can't see how the fuel pressure rises under boost. But Kirban is "the bomb", so I guess I'll have to trust it until I can eventually find my way to a dyno.