These kits complete with express warnings to not be attempted by non experienced modelers. One should really do his homework well be fore these kits are purchased. Some of the oldr PzIII's dont even have newer boards in them so they cant be used. Always make sure you know what you have then figuer out what you have to buy, and if your even capable of doing the mod.
Me personally have a very difficult time with the electronics of these tanks as they all seem to be wired differently than the previous one , even the same model tank. So if you dont have experience with the electronics think twice. It does not take but one wrongly placed wire to fry these boards.