the emanage has the main harness, for power and interception of the MAF signal, and two optional harnesses, one for the ignition control, and one to add pulsewidth to the injectors when you need to add fuel.
On a NA toyota you rarely have to add fuel, so you could get away with not purchasing the injector harness.
To take fuel out of the map you modify the AF map which works with the MAF sensor signal.
Ignition timing is where you make the power on a NA car, so you will need the ignition loom otherwise the emanage is pretty much a waste of time.
read the FAQ at
http://www.mohdparts.com/emanage as the plastic plug you need for the extra socket on the emanage comes with either the injector or ignition harness, I can't remember which one.