Thx got the gauge to stay on with engine off and it reads 0 PSI.
Quote:
Originally Posted by steve99
Turn ignition full on , but engine off, map srnsor or guage should read 14 psi or 1 bar ie atmospheric if absolute or. 0 psi 0 bar if reliative
Also depends if your looking at reliative pressure or absolute
id say your reading reliative on one and absolute on the other
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