85 300zx gauges posted by Eishiba on May 27, 2012 at 08:20 AM
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Hi, i don't know about the Z31 gauge setup but I do know that the boost gauge should read -7 at idle and then go up towards 0 and into positive under load.... +7 with foot flat to the floor... lol.. I'd say either the gauge is no good or you have a boost/vac leak.