a 2wd saph loom is probably the best loom out of the standard looms to use for easy of fitment, just fit the corresponding 9 pin plug, relevant wiring and away you go

As Stated, you only need 4 wires to get an engine to run

1 Earth
2 Permanant Live
3 Ignition Live
4 Fuel Pump Triger

All the extra are purely guage based, i.e Rev, WTS, Oil Pressure etc etc and not needed to actually get the engine running