Ok new winter project.. MK4 escort 2.0 zetec turbo.

Putting in the engine etc is the easy part for me, the part I find hard to understand is what ecu and loom to use, total noob when it comes to electrics.

First off, does the ECU control everything IE engine, clocks, lights, indicators etc, meaning if I where to take the 1.6 ecu and loom out then all the cars wiring would be out and nothing would work? or does the ecu and loom just connect to the engine, rev counter, temp gauge, oil gauge etc etc.

The reason I ask is I was thinking of using 2 ecu`s (keeping the 1.6 ecu and loom in the car) and using another ecu to run the zetec turbo!

If this is possible? how would I go about doing it? what parts of the 1.6 loom would need to be cut out? and what ECU and loom could I use to run the zetec?

I am good at learning/picking things up, I am sure If I had a basic Idea of how this could be done then I could do it, any help would be greatly appreciated

Thanks