Picture 1: Run some silicone hose from vacume pipe to boost gauge in the cabin
Picture 2: Underneath "TURBO" pipe near the inlet manifold.
Picture 3: View of the "TURBO" pipe where the pipe going to the boost gauge will be plumbed in. Conect a T-piece in to the vacuum pipe. You will need to remove the cast iron turbo pipe that links the inlet manifold to the turbo.
Picture 4: Mount the boost gauge in the desired location