There should be a wiring diagram for the rsm in the box for it and you will have to find a pin out diagram foer the ecu then online somewhere.
simples
As said all info is on apex USA , it's been a while, but there's only a couple of wires simple enough, pink and purple are speed cut in and out, the batt ground etc, just go on and get the euc pin out of a r33 are download a r33 fsm