I have a HKS wastegate Im going to install but I am unsure of where the piping is meant to go as the standed actuator has one pipe and the external one has 2, as can be seen in the photo. Any help would be appreciated. Some original photos have not been recovered yet.

This has been covered heaps if you do a search you should find a fair bit of info. Basically your wastegate will have a spring in it with a psi rating. To run whatever boost that spring is rated at you run a line from anywhere that see's boost (comp cover, plenum, etc) straight to the bottom line. And leave the top line alone. If you want to run a adjustable boost level then you run an extra line from anywhere that see's boost to the top nipple with a boost controller. This boost controller will work in opposite directions through. If your turn it in the + direction you will see less boost.

Thanks for the help much appreciated.