i bought a rb swapped 1991 240sx coup. It came with a halltech ECU and wiring specialties wiring harness, all of this was swapped out of a R32 GTST so I am not super worried about getting it running, what I am concerned about is there are two other harnesses on each side of the engine bay which i was told are the stock 240sx wiring harnesses. how should I go about getting the 240sx chassis working on the RB25 (dash, head/tail lights, break lights and reverse lights)? if I wanted to wire in a head unit would that be done into the chassis harness of the 240sx? any help or key words to look deeper into would be appreciated.