Right loom,

You can essentially treat the engine loom as being two separate units, one is for things like the alternator, starter motor, battery, lights etc. The other is for the engine, so sensors, ecu, ignition etc.

You (if using aftermarket management) keep the first loom (with lights and stuff) and make your own mini loom for your new ecu, which would have wires going to the EFI inlet (for injectors and most sensors), and wires for the cps and lambda.

Have a look though old posts using the search button, specifically ones with megasquirt in the title as you will learn a lot from these (even if you don't end up using megasquirt)

This is a bad photo of en efi inletm you can see it has the majority of sensors present a a nice connector for attaching to you new mini loom,



This is pulled from the megasquirt web site but gives a good idea of what inputs and outputs a vehicle ecu has, most aftermarket ecus (and factory ecus) will have simular or identical inputs and outputs.



This (at time of photo) was the most expensive table in the house lol but has some or most of the things on it you would need for a nice efi install



and a picture of what a megasquirt ecu looks like



Rob,