you need a valve from an old rim or bicycle tire, (2) 2"pvc "caps", a length of 2" flexible tubing to be clamped over the caps and a reducer that will be clamped onto a cap and the turbo inlet. (I forget exactly how big the turbo inlet is, I think it's 3.5")
You need to drill a hole in the caps and use glue or epoxy to mount the air valve in one of them. Then you'll clamp the tubing tightly around the cap and the other end over the other cap, the reducer over the end cap and big side over the turbo inlet.
Make sure all the clamps are tight and then use a bicycle pump with pressure guage to pump like 15 psi in. Then just listen for leaks.