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When i put a vac gauge in my civic i just teed it into the brake booster line. Then i ran some pneumatic hose through the firewall to my gauge. It worked great.
The revving you describe suggests an air leak in the intake pipework. Go through all of your connections to make sure they are tight and sealed. Also check your vac gauge. There is a tiny possibility that it is leaking. Take it out and apply a vacumn. Listen for hissing or just the sound of air moving. Should be quiet, otherwise the gauge is faulty.
I must also point out that if you do tee into the brake booster line, make sure your connections are solid and won't break. Although if you are paying attention to the gauge you'll spot vacumn problems quickly.
ollie
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