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I can't remember where I got my MityVac, just that it was a good deal. Maybe Harbor Freight years ago. The pressure port sticks straight up, on the face side of the gauge (and pressure does NOT read on the gauge -- only vacuum).
There is no pressure release either, like there is for vacuum. You have to ease off the hose or line that's on the pressure port. No need for clamps there. I just use cheap vinyl tubing that pushes on snugly about 3/8" or so. Holds 15# or more of pressure just fine.
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Bruce Young '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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