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the top one you can just let vent to atmosphere. the top is only useful when utilizing an electronic boost controller. just have a vac source to the side one, and leave the top one open.
Source: [url=http://www.turbod16.com/viewtopic.php?p=201698&sid=e14cda1b33a60f9c6ff076dd1fc083c5]Turbo D16 :: View topic - Wastegate problem[/url]
put that little circle nipple thing in the wastegate... The round metal piece. You have to put that right up against the valve on the wastegate.