im useing a 18 guage wire there is one wire that goes to the starter and there is one wire that goes to the battery its just a regular push button i got it from auto zone its 60 amps heres the link

http://www.autozone.com/autozone/accessories/Dorman-Conduct-Tite-60-Amps-starter-switch-with-sealed-push-button/_/N-2666?counter=0&filterByKeyWord=push+button&fromString=search&itemIdentifier=6459_0_0_