Thank guys, well Ill try to answer the questions. If I miss one please just ask..
The engine has its own key switch panel.Only one wire to hook up and thats the battery terminal. everything else is self contained in the engine. I thought about rewiring it to the original key switch but haven't done it yet as I can reach it easily. It does have a charging circuit, I think its only about 3 amps but it keeps the battery charged just fine. Ive started it many times already and the battery is still strong. Im fabbing a cut-out piece for the hood. I had to cut out a small section of the hood to clear the engine. I kept that piece so I could "extend" it outwards to cover the air cleaner. It acutally looks just fine with the piece cut out but ill end up putting it back in anyway. I still need to hook up a throttle cable.
The engine is very quiet.Starts super easy, even with the pull cord and has plenty of power. Gets about 3x the mileage of the old Tec engine.