Autometer Vaccum Pressure Guage...Help

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Thanks for the replies. I have a stock intake still on the car, and last night I checked every vaccum hose going into the manifold (and out). All of the lines are larger than the T-fitting supplied by Autometer, which leads me to believe that I am looking at the wrong lines. If anyone knows the exact location of the line, that would be helpful.. Thanks a bunch!