Anywhere post-throttle body should give you and accurate reading. I T'd into the main vacuum line going to the vac. reservoir on my truck. It's not difficult to find a large line coming off the lower manifold to tap into. Do not tap into a vacuum line that is routed to any sensor like EGR or FPR, that's just asking for trouble. I also did what Crash recommended with a $15 parts store manifold gauge to make sure my Boost gauge is reading correctly.
Idle reading:
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2000 F-150, 5.4L, SuperCab, Flareside, ATI ProCharger
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