i have a greddy profec a boost controller and i am using an eclipse gst turbo on my car but the wastegate only has one fitting for a vacuum hose is it suppose to have 2, my boost goes up to 20 psi? any ideas anybody or could it be my wastegate is messed up

 

vacuum goes to the controller and the controller is connected to the vacuum input of the wastegate.

 

thanks but my friend has 2 vacuum hoses on his wastegate and i have 1 does it matter if there is 2 or 1 vacuum hoses?