It clips into a recess above the steering column, and is a royal pain to put back in once you have removed it, if you don't take out the steering column and vent duct first.
I disconnected all of the wiring connectors and untangled the wires which seem to have been trimmed. This resulted in much swearing and the door sensor being damaged. The black metal piece which holds the buzzer/logic box/indicator relay is now dangling next to the clutch pedal, does anyone have a picture of where this should go? The are no holes cut into it and no obvious mount points on the bulkhead.