Does the vacuum side reflect the same - number as the + number during boost. If the vacume is -25, should it also boost +25 or is it completely different?
I have a VDO Visions series mechanical boost gauge. It looks very similar to the stock gauges with a black face and white numbers. At night it lights up green with a red needle.
93nut i'd be suprised if even the vacuum portion of your boost gauge was in PSI also. I've never seen one setup like that. There usually set up in "hg for vac and psi for pressure. I forget what unit the vac is in for gauges where pressure is in bar though.
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