Quote:
Originally Posted by MikeSVX
It's a vacume gauge, that's why it reads negative. This gives it a use on non boosted cars as well.
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We know it can read vacuum and thats why it goes below zero. The numbers below zero should not be negative is the point. Vacuum gauges are not negative and they do not read PSI like that gauge. They read vacuum(inHg). More info on the topic if you click the link in the OP.