1- between the solenoid and the wastgate, the other is the bleed off of the boost, and would decrease boost or do nothing if you put it there.

2- follow the BOV's actuation vac line back (the BOV is under the boost solenoid), there is a rubber section on this line near the drivers firewall (next to the brake fluid resevoir), it's about 4 inches long, cut it and put a 't' piece in there run the boost gauge from this, clamp all 3 sides of the 't' piece Click here to enlarge.