Fast install

I am putting a fast on my 95 gt.I am having trouble figuring out what all to remove from car.I removed the plug in the passenger corner and it containted all the injectors iac,o2s,and all sensors.I removed the ecm.I want to take the whole harness out so I dont have it just hanging there but the lights and all that are tied in.I know on 87-93 you can remove it but are cars seem to be different.I need some help guys.Can I get away with what I have removed and just leave the factory harness there?it looks like my gauges will still work because there are three plugs that are not in the ecm connector and they head over to my column.HELP!!!!