hey guys im gutting a gtp for my l67 swap stuff.the car is at my work and i gotta finish getting what i need from it so boss can crush it. my question pertains to what all i need wiring wise.i have the engine harness from the fuse box on fender out.have computer and fuse box underhood..do i need the harness that goes from the underhood fuse box to the insideof the car.and is there anything else in there i need