The bypass valve is pneumatic and operates from engine vacuum. It's the same actuator as what came on the GM3800, there's no need to have the PCM control it if it's hooked up properly. The PCM control on the 3800's was used to prevent it from engaging when overtaking on the highway and control surging when used with the cruise control system.
You only need the one bypass valve, there's no need for a seperate blow-off valve unless you're only running the single throttle downstream of the supercharger.
Did you ever get your engine running for this project? Your last thread indicated you still had some issues.
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