If you plan to install the complete S13 loom then please take a little advice

Mount the computer under the passenger seat so you can get to the diagnostic screw and lights then work back to the dash. the loom is too long for the datto so either chop or bend it into submission in hidden areas.
I have rerouted mine (in a major way) 3 times - it's a pain. Mostly done before the windscreen went in.
I also mounted my Auto ECU next to the heater on the passenger side (you won't have to worry about that one)