I would like to get a helms manual for my car. I need to figure out the differences between my cars wiring harness and the GSR. Although everywhere(autozone, advanced auto parts, and napa auto) seem to ahve Hanes manuals. Will this be good? I've never heard of them before? Or should I order the helms online? If so, which one? Theres a service manual and an electrical troubleshooting one?