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Re: 21 PSI on a GIAC Chip, this normal???? (Hapa88)

I use my boost gauge as a "REFERENCE" number only, I now only trust the numbers that come out of the VAG-COM. I've noticed difference 1-2psi from what I see on the gauge and what I log on the PC. Also the ECU looks at Pre TB pressure and gauge looks at manifold pressure (after TB.)
 
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