Well, I dunno? I plan on just laying it out on top of the motor, and go from there. I read some where that the ECU needs to be grounded, so I'll find a place to bolt it to the engine, or make a bracket. I bought a tip sensor, which will need to be in the upright position. Not sure if I need a voltage regulator hooked up, or not. The motor is all the way out of it's frame. I left the original short harness that sits on top, and goes to the injectors etc. as it wasn't damaged. Will have to plug in the coils, maybe they too need to be grounded? New/used harness did come with all the relays, even the headlight wires/sockets. It will be a challenge, but when I built up my 05 low rider, it was a bare frame, and the harness was in a box with all the other parts, so it can be done, just waiting on arthritis to ease up a little. I'll also have to fab up a fuel pump and regulator system. On and on..... Does anyone see a problem with using this diagram to wire the ignition switch ???