one of those plugs, on the afm side is the 12v+ for the injectors, it has spade terminals. You need to wire that up otherwise it wont work. Its a lights grey wire on the r33.
You also need to run an inline fuse, check the full 34 diagram to check what amps but I think its 10 or 15.
To check if the injectors will work switch you ign to on, then take one of the injector plugs off, should have a 12+v coming out of all the plugs, just earth the multi against the body dont try and use the negative on the plug as its pulsed thru the ecu. Its a light grey wire on the r33, but for the r34 neo it may be different. Its the wire thats the same colour on all the plugs anyway thats your +.
Have you also given the eccs relays constant 12+?
Those plugs are nothing to do with your headlights, thats on a completely seperate loom all together.