run the cable along the passenger (nearside) of the car - the same side as the battery.
From the battery you will find a cable box that runs underneath the airbox and then back up to the window height before going through the bulkhead. At the bottom of this (before it bends up towards the windscreen) there is a grommet that comes out just underneath the glovebox in the passenger footwell. I used a wire coathanger extended to thread the cable through.
head over to
www.icecavern.com and speak to the guys (esp pete) there - they know a lot about this stuff