I duplicated an original main harness. In construction, I use the same gauge of wire, the same colors and tracers (stripes), the same length and sheathing, the same terminals, etc. All terminals are of the double crimp, strain relief variety.
Note: Main harnesses comprise the main - or primary - wiring harness. Each motorcycle also uses ancillary sub-harnesses. The individual sub-harnesses are sold separately.
Originally, Moto Guzzi routed the wires to the ignition switch through the Molex connector. I've found this to be troublesome. I prefer to route the wires directly to the ignition switch without going through the dash harness or any connector. Please let me know if you would like this modification.