:homer:
Right, you have 3 ports on the solenoid, for the HKS solenoid it is as follows: (PS. The ports aren't in numerical order, so look at it as the numbers are on it. You will see that 3 is the middle one, like my pic shows!)
Port 1 goes to a vacuum source on the inlet manifold.
Port 2 goes to the turbo, so one piece of vac hosing goes from this port to the port on the turbo like in the picture.
Port 3 goes to the wastegate actuator. If you have a HKS actuator there is only one place it can go:
Its best if you go out and have a look mate, you'll figure it out then! lol
Hope that helps!