Just received my vacuum gauge from Northern Tools, its a Valley Instrument Grade B Back Mount 2in Dry Gauge-Vacuum #1220DSBVAC, 1/4" NPT male connection. I installed it on the balance tube at an open port just in front of the brake booster vacuum hose. Seems to fit perfectly and work as expected. Currently I'm running right around -20, steady needle which is a good thing.
For info on reading vacuum gauges, check out http://atlanticz.ca/zclub/techtips/vacuum/
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