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There's a white tube running from a vacuum 'tree' on the intake manifold. You'll have to remove a black plastic cover to access it. Probably will slip right back on. (I read another post where the owner found the pressure line to the gauge disconnected behind the battery so you may need to check out the whole route.)
The gauge measures intake manifold pressure, not just boost. That's why it has negative pressure (vacuum) readings as well as positive pressure readings. The turbo is always producing boost. (Saabs read boost only.)
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 David 1998 S70 T5SE // misc mods (mostly lighting) // red calipers // Michelin Pilots 1992 940 GLE//SilverStars//Hella MicroDE
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