To save money I was planning on using the wiring harness that came with my LS1. I talked to a guy up around Dallas and he said to use an S&P harness instead because it was easier to install. The harness I have is already installed on the engine and I'm sure there are a few wires that I won't be using but I think it will work fine. The guy I bought the engine from already removed the VATS out of the computer and flashed it for gearing, tires, etc.... What do you guys recommend?

Thanks, Lance