If I'm not mistaken you should have red, black, orange, yellow, and green on that switch. I can see a probe on the left of the picture. That would usually go in between the fin of the radiator. Detects heat. Also on the switch it self should have a adjustment for the temp to trigger it to turn on. Red goes to power. Black to ground. Yellow to an ignition source so you can he power when ignition turns on. Green goes to power side of your a/c so the fan can kick on when the a/c turn on. Optional unless you want your fan running all the time. And orange goes to your power side of the fan. If I'm not mistaken that's how it goes. Would have to double check when I get back home from work.