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To bad you didn't that sucks....but the FPR and gauge are also good tunning tools, you can actual loose about 2-3 in/hg (with incorrectly gaped sparks plugs, overly retarded ignition timing, even a misfire will upset your vacuum, and driving to different elevations will make a difference for about ever 1,000ft or so) so its a good little indicator as well.
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