There is a hard line attached to the under side of the outer boost hard pipes. They are 6mm lines. The DS connects to the fitting on the side where the clutch booster connects. The PS connects to the metal line that bolts to the upper plenum brace, then from that brace to the balance tube.
Let me know if you want me to dig up some pictures.
------------------------------------------------------------------ 1992 300ZX NA 5 Sp (Dead) 1990 300ZX NA Auto 2+2 (Dead) 1990 300ZX TT 5 Sp (Building) 2004 G35 Sport 6MT (DD)