The needle never stabilizes - it fluctuates at least 10psi. I replaced it with a Revain oil filled gauge and it reads great. Used on GEN1 SBC 350 with Delphi MF0002 3 way pump and QuadraJet carburetor. Although I think I should expect some bounce from the SBC 350's mechanical pump when it's pumping at 10psi and looking so fast like an airplane propeller isn't what you should expect.
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