Boost gauge reading with engine off
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It should read zero. The air in the intake is at atmospheric pressure so their should be no vacuum or increase in pressure (aka Da Boost). Probably just the typical analog guage thing where they can be inaccurate from time to time. Plus, the fact that the cluster is at 12.6 volts vs it'* operating voltage of 13.8 might have a minor influence. FWIW mine is the same, reads like .5 of vaccum when key'* on engine'* off.
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