I bought a used FAST system for my GN.I got a couple wiring ?'s .Its obvious the plug n play harness plugs into the stock harness and the other plugs into the FAST box.Its also obvious the O2 harness plugs into the O2.Now I have 3 black wires that come into 1 connector that is labeled battery negative.Thats self explanatory.Then I have a thicker black wire that has a fuse connected to it.Is this a chassis ground?Then I have a pink wire labeled injector harness.Where does this go?Any help, tips,comments would help me.Thanks,Tony