its pretty close to the ignition, right under the steering column,
in the hks manual it says:
red - 12 volt constant
green - 12 volt ingnition
blue - 12 volt accessory
thats how I wired them up.
I dont think I have ign and acc mixed up because if they were, my accessory would stay on till the timer timed out.
one other weird thing I have noticed is the speed display is incorrect, ie at 50k/h its reading 25. so the timer thinks im going slower than I am, and thinking I am reving fairly high for my speed, and the auto timer goes up very quickly, not sure if its related but it may be another indication of a faulty or damaged unit.