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Ok, I am really trying to draw a baseline for my car, it has had many vac leaks, and was wondering what is the stock negative pressure on the car? I have the stock gauge and a aftermarket gauge the stock gauge will read -13 or -11 the aftermarket gauge will fluxs between -20 -21 -19... This was prior to today's vac patch job.. Now my aftermarket gauge is saying -10 -11 the stock gauge hasn't changed..
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