Vikki is right, the American kit requires you to cut your wires to length and solder your connections. This does allow you to custom fit everything but is labor intensive. I found it satisfying and relaxing. In hindsight, completely wiring a car was relatively straight forward and simple. However, it was challenging at the time learning where everything went and how it worked. Rewiring a fully assembled car will take more time but if you break it down by rear harness, dash harness and engine compartment and set a goal to just complete one component at a time, you should be able to complete it in a few weekends.