I mounted my switch inside the tank, on the very top edge. Its easy to mount, with the man body off, you can put it on the top, near the inside edge, the main body will not sit on it, there's plenty of room. I thought it was crazy to mount the switch inside the turrent, and have to take the turrent appart if you need to work on anything. With the switch mounted in the "instruction manual" location you would need to turn the turrent to turn it on, its just a easy to pop the turrent off and slide the switch.