here something to think about. a turbo runs off of exhaust and when the car is started, no exhaust yet but the engine needs air to run. so the engine will suck in air creating a vaccum, thus reading neg boost. once its running and pushing out exhaust making the turbo spin, the gauge will read positive pressure
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88 N/A w/ 5spd - stock - not running, bhg
87 turbo/targa w/ 5spd- fidanza light weight flywheel, new oem slave cylinder, apexi air filter, no ac and no heat
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