just wondering best vac line to tap into?

when i had my 03 GP i tapped it into the vacuum line running right under the supercharger'* snout

Yep, the line under the snout, it also goes to the MAP and the FPR.

thanks going to put it in this morning.

well i tapped off the vac under the snout.start the car,go for a spin.i was only getting 2 psi.first thing i thought about was either the bcs or bca..disconnected bcs and then BAM!!! 6 psi..... ive owned the car now 4 months or so and though it was fine.well i was WAY off.thanks to all you guys and tricks i found on here really help alot.

What has the gauge on the dash been reading all this time?

just before the first knotch