RB20DET swap in 91 Hardbody!!! Need wiring up help please!!

[91HardbodyRB20DET]

Heres the lay out. I used my original Ka lower wiring harness and the rb engine wiring harness and ecu. For the lower harness i changed out the oil pressure sensor and trans sensors. direct bolt ins. i have no idea where to go from here.

i need help to find wires i need to splice intogether. and my chassis harness is so huge and is still tied into the 4 cylinder engine harness idk how to separate if need to.

Do i plug the engine harness 6 plug wire onto the ka lower harness? It has a 6 plug wire just one thing is differant on the inside of the plug.

Ive read that on a S13 they use the grey oval plug and a brown plug. i cant find them on mine. they are both KA engines so i dont think they are to differant but idk.

If i can get help you would be a life saver and i cant find a pinout for my stock ecu and that would help to.

thank you