The diesel upgrade isn't impossible, but it's just a bit more "fiddly" due to the multitude of very fine wires in the kit. They provision every possible option, ditch lights on front and rear, strobe lights, marker/class lights front and rear, MARS light, etc. So, you get a rats nest of wire to deal with. If you proceed logically, you can do the upgrade, but it's not as easy as the steam in that regard.
My personal method is to remove any wire from the board connector that won't be used in my specific upgrade, that normally reduces the pile of wires by about half and makes it more manageable.
