Posted for "Shannon Knoepflein" <kycshann@kyol.net>:

There is a vacuum on the intake of the turbo, but you are obviously
correct about the outlet being pressurized.  I think what Richard was
suggesting would be a tap off the inlet side of the turbo where you will
always have a vacuum.
  
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Shannon Knoepflein   <--->   kycshann@kyol.net