easiest way to remove is to list what to keep lol...

fan switch wiring ...
green wire for rev counter
reverse light switch wire
brake resoviour plug
temp sendor
oil pressure switch
starter and alternator loom
all you lights ect
earth straps
washer bottle if its in the front like mine

basicaly you remove anything that does ignition and fuel like all the wiring to ecu and metering head... but keep the wires from the ignition switch to the relay on the innerwing as this runs the rev counter and fuel relay... and someone on here will tell you how to use with a coil pack