Old garbage disposal is hard wired, I can see where the wiring comes in for the wall on/off switch, and the power wire. New is a three pronged. So what is my best option? Because I have read that it should be plugged into an outlet. Here is a pic. The biggest problem is it isn't the only thing they have running to the wires, dishwasher and stove also run into same wiring. I could install a new outlet coming from the power wire. But I would have to install prongs on all other device wires. Then what do I do about the wall switch for garbage disposal??