I Have a 97 LS400 with the Nakamichi sound system. I want to take everything out and replace it with aftermarket parts. In my research, I've found there is no harness that is a plug and play from a new head unit to the factory amp, so I want to take everything out and replace it. As far as I know, the wiring harness should only be responsible for connecting the deck to the car and because of that, I can use a standard toyota harness. Is that the case? I've been trying to figure this out and I think I'm making it overly complicated.