Wiring Electric Fans

I just got a New Aluminum radiator and dual 12in fans. How do I wire them? and would it be a good idea to get the Flex-a-lite Variable speed controller? That way I can keep the temp between 180-190 on the street and lower on the track between runs.

well when u going down the track they shouldn't be one if u can help it... just get two 40amp relays and wire them to a switch and/or a temp sensor that grounds...