How to switch 7 wires with a single on/off slide switch
N-pole switches, for more than a few N, are usually rotary switches. For example, you could take the switch out of a commercial 2-way serial port  or VGA port switch box, which will have at least 8 or 9 poles. You might even have one of these lying around somewhere &mdash; I know I do.



Here a stack of various switches I found laying around the office:



Opening the one second from the top, I found the following switch. It has 16 poles, but only 9 are used.