Dick,

You are not looking for a vacuum source, you are looking for the boost output from the turbo that goes to the wastegate actuator. Basically the G-Valve that you have got is not a bleed but rather holds the boost pressure from opening the wastegate until the boost limit you have dialed in is reached. This makes for much quicker spool up time and more responsiveness but as one person has already suggested, gwt a calibrated boost guage before you start dialing it in and listen for pinging and knocking, both are catastrophic. I didn't feel safe dialing mine in until I also had a Air/Fuel ratio meter to see when the mixture started leaning out. Keeping the lines on the G-Valve as short as possible helps to limit boost spikes. I have the K version of the B230FT and felt that 10 psi was a good limit until I run a compression check and do a few other things, Good luck, my wife could even tell a difference after I put the G-Valve on our wagon :-)