if any one is clued up on the wiring please get in touch via pm as ive read so much shit on this and im even more confused than i was !!

ive read to run 2 ecus 1 for the engine and 1 for the car but removing the the standard ka engine wiring from the ka harness . but ive just read this is a total bodgy job and not the right way to do it.

or

use the standard ka engine wiring and just plug the rs1800 ecu into it , but then this means that the 60 quid i just paid for the rs1800 wiring loom is waisted ??

some one please help me lol