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Wherever you can attach a fitting / hose after the air filter. Afaik, no need for accuracy, just indicated somewhere you are at maximum vacuum, whatever that happened to actually be. In the F 250 7.3 diesel, that has to be at idle, otherwise you are making boost from the turbo unless you are engine braking, maybe (I never checked) the 7.3 doesn't have throttle plates, the Intake is not regulated, fuel addition is the throttle
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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