Quote:
Originally Posted by 87Regal3.8SFI
Yeah but mine reads 5 PSI at idle with the vacuum hose off. Put it back on it reads 0 PSI until you start getting into it.
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Vacuum hose off = 0 vacuum, 0 boost = atmospheric pressure = point at which the boost gage needle would read actual zero, just before starting to lift off the peg when driving = the exact same factory gage calibration error as mine (5 psi)....
Anything less than 0 psi boost = vacuum = factory gage (should be) reading zero... Some factory gages are off enough by now that even under an idling vacuum condition, they will show some boost on the lites. If I pull my hose off the map, my factory gage will read 5 psi also, running or not. Copy? Over?
