I am in the process of completely rewiring a 1971 Road Runner using an American Auto-wire harness kit. I have found a few issues with the kit but mostly, in the wiring schematics they provide but so far have been able to work around them by using other schematics to piece together the puzzle. HOWEVER........I have not been able to locate any schematics that show the tach wiring for the rallye cluster. I know one of the wires is from the neg side of the coil, but what is the other one for and which one is which?? This is just the way I found the wiring and is one of the main reasons for the rewire.