I reckon I can help here.

The 2 looms are engine loom and dash loom.

Speed sensor, tacho, and 12V ignition and start signal are the important ones (generally) from the dash loom.

All the rest will need to connect up to fuel pump relays, ECCS relays and important fuses.

The SR20 has a ignitor pack (transistor pack) which needs to be kept wired into the multicoil circuit.

For the engine loom, think of it in 4 parts.

1. Electrical stuff: Alternator, Starter motor, knock sensor
2. Ignition: Coilpacks, Transistor pack
3. Fuel: Injectors (ballast resistor for injector impedence?)
4. Sensors: water temp, TPS, CAS, Idle Control, Airflow Meter, O2 Sensor, A/C Idle Control

There is no method of hook it up and get it running.

There is the method of: hook up sensors, wire up the fuel pump, connect correct wires to ignition 12V, always 12V, and start 12V, then remove all of the crap (Including check connectors), and then spend a week shortening all of the wires, because they are all between 1 foot to 3 feet too long.

Do you have the S14 wiring diagram for the SR20?

I have a PDF that might help, if you need it.

Chris