Try Dwyer's range of Differential Pressure gauges. Its very industrial looking and takes some space on your dash. I would think they were developed with industrial analyzers in mind. Very good if you're trying to find ways to reduce Intake flow losses as per Autospeed.com.
I don't think Vacuum Gauges made it to the mod scene and therefore never grew in popularity. And due to recent instrumentation trend of going all electronics, manufacturers don't make many of them.
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