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Never t off of the fpr line or wasgate line! It can work but increases chances of failure on to critical components. You don't want to run lean or over boost. And you can run the boost gauge off that bottom nipple if you don't need it to read vaccum.
From HeavyThrottle's SRSWAP FAQ:
Quote:
The vacuum lines are simple: 3 lines start at the throttle body. The bottom one goes to the canister, block it off unless you are using the canister. The larger one on top runs to the bypass valve (BOV). The smaller top line tees to the fuel pressure regulator, and runs across the front of the engine to your boost gauge and/or the boost pressure port on your boost controller.
The wastegate gets its signal from the nipple on the intercooler piping. The Apexi boost controller stepping motors go in between the IC piping and the wastegate actuator.
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