AND WE DON'T KNOW WHAT YOU ARE TALKING ABOUT??? Give us a little info, so we can see what you have. Model and serial numbers of the unit and the engine are needed. Model and serial numbers of the old engine. Pics of the connectors you have and you knowledge of basic electricity on these types of engines and tractors, would also help. If you don't have this info, for $1000+ expenses I'll come there and do it for you.