You can't find it on the aristo harness because it most likely didn't come with the harness(it's part of the body harness) so you will have to depin from the big weird plug(which is what ij1 connects to) to wire it up. Its been a while since i saw an aristo harness but it should be something like this...Follow your wiring harness to the end where the ecu plugs are. I think there should be 2 plugs only and the ecu plug will have a bolt, the other might have a bolt too, I can't remember. Plug the ecu plug into the ecu, the other one that doesn't plug up is the weird plug I'm talking about, not sure what it's called but this is the plug where ij1 and ik1 plug into. Also, the other 40 pin ecu plug, does not come with the harness, if the place you bought your engine from from didn't supply it with your ecu you will have to source that plug out.