Check my build thread. I'm on mobile so I can't figure out how to link properly but I set mine up slightly different from everyone else. I just got a parts store adjustable controller with a probe for like $40.00 and wired it into the "high" setting and ran a switch to the cab for constant low if I need to over ride it. Works perfectly for me.
[size=2][b]June '13 YJOTM[/size][/b]