One the passenger side in the firewall there is a hole.
The easiest way to get to it is take the battery out and the Standard airbox if you still have it if not just take off the pod. From the engine bay you will see the hole in the fire wall it has a rubber cover covering the other wires. just poke a small hole in the side and feed the vacume hose through. This job is made easier if you have the metal vacume line.
Or you can do the dodgy and run it through the door up over the front 1/4 pannel between the pannel and the windscreen and into the engine bay that way.
I suggest take the time and use option 1