Eclipse Spyder FWD L4-2350cc 2.4L SOHC 16 Valve (1996)
Boost Gauge - Supercharger: Description and Operation
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When the ignition key is set to the "ON" position, the gauge indicator will be at "0".
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When the engine is started, the indicator will move from "0" to the minus (-) side. Then, as the boost level increases, it will move to the plus (+)
side.