Graeme
I presume you mean P68A, which is a speed controller? The P44 would have been a better choice in that it will accept any voltage for the load from around 2v up to 35v. If you haven't done anything except unpack it then I'm sure CompShop would do you a swap for the price difference. Ring and ask for Kyje (pronounced Kye) and tell him Dave sent you…
DM