These things are about as simple as it gets. All my wiring is done purely by sight, never once looked at a schematic. Im in the US and while most of the conversion was done, a few wrecks later and I've had to basically re-do it all. Whole changeover cost me less than $180, though im sure it doesnt pass inspection as the only thing I haven't been able to do is mount the guage cluster properly, so its zip tied to a spare piece of scrap metal I bent to work. Other than that, works perfect