The first thing you want is the 18R-GEU intake manifold, throttle, fuel rail and injectors. And of course a EFI fuel pump of some sort.
Then you want a water temperature sensor, the 2 wire sort, off a Camry or 4A-GE or whatever.
You want the electrical plugs for the injectors, and TPS and coolant sensor. The electronic dizzy off a 18R-GUE will do.
Then you want any programable computer you can find. The cheapest and simplest would be a second hand MicroTech MT-4 fuel only computer. Wire it up from scratch, but only about 8 wires are needed.
Today I was actualy tuning a AE71 with 2T-GTE and MT-4.