Trinary switch ls3 Fan on with a/c

[redzo6]

Hello, I have a crate ls3 engine. I am hooking up a trinary switch and want the fan to come on when the A/C turns on. My relay is from VA and it has 5 wires. 1 full time power, 1 ignition power, 1 fan wire and 2 white wires. My question is do I hook up all the wires as in the diagram and ground both white wires and leave the blue wire on the trinary switch unhooked?

Also my rpm is dropping and sometimes shutting engine off when the a/c is turned on. Do I need to get the engine tuned?