It's just a simple switch from a auto parts store. Has four positions on back. Ignition, Batt, Accesories, and the one in the middle is for the start. Here is a link to one.
http://www.oreillyauto.com/site/c/detail/CTI0/85936.oap?ck=Search_key+switch_-1_3229&keyword=key+switch
I hate doing...