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I have a cheapo, off brand, aftermarket boost gauge in my car that a previous owner put in. At idle, it pretty much pegs the negative boost side. -30inHg, or whatever it says, no problem just sitting there, purring along. Sometimes even going past the end of the meter while driving... However, it seems to read properly under full throttle...11-12psi... Is this thing just reading weird vacuume? Do I have an unaparent problem? Is it just a piece of shit that's not scaled properly? Any ideas greatly appreciated.
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