Boost Guage line

[YNOT]

Got the boost guage working sort of. I stuffed the olive up that goes into the cooler but managed to fit one from a bike brake system temporarily. The guage makes an annoying rattle noise when it's returning to the 0 psi point. Is this normal?

Did you fit the tiny restrictor that should have come with the boost gauge?
My boost gauge has a very light rattle if you listen carefully but once you start driving and have the radio on you can't hear it at all.

Tony