Quote:
Originally Posted by Piotrsko
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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No; after the throttle valve is the important factor for finding overrun.
After the air filter but before throttle will give you higher vacuum at full throttle where the air filter etc is the major cause of vacuum.
Also: Interesting that you consider personal testing to be of import here, but not elsewhere...