Parts needed:
30 amp DC illumated rocker switch ([link=http://www.radioshack.com/product/index.jsp?productId=2103602&cp=&sr=1&origkw=switch &kw=switch&parentPage=search]Radio Shack cat# 275-712[/link])
Pair of Deans Plugs
Some switchPower wire (preferably some red and some black)
Crimp connectors (unless you want to solder the wire directly to the switch like I did)
Heat shrink tubing to make the job look professional.

Im not going to do a step by step because its pretty self explanatory when you look at the label on the switch (one connector is power, one goes to the load, and the last one is ground). I used the Deans connector that way I could eliminate the switch system at any time.

As for the durability of this switch and the possibilty of it failing midflight.... This is the same type of switch I have used for years back when I used to do custom audio/video installations in cars. The failure ratre of these switches is probably 1 in 100000 cycles.