I have probably decided to swap an 90-91 ls motor into my 88 si. I was just wondering if use the engine wiring harness from the ls motor, or the engine wiring harness from the stock si motor? Should the ls motor harness connect to my car's main wiring harness? Or do I just connect all the connectors from my engine harness to the LS motor? I just want to make sure I wont run into any wiring problems.