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New mechanical ISSPRO boost gauge makes a rattling noise under boost.
Thought there was something in the gauge, took light out and shook, but nothing came out.
Then pulled the gauge out and put it near my ear while driving. The rattling is from inside the gauge as the boost climbs.
ISSPRO says it is from pulsations that occur under boost and I'll have to live with it. It is very annoying and frustrating noise coming out of my brand new gauge.