o'reillys has a hayden radiator probe for controlling electric fans. Runs about $20 and you can dial it in to come on at any temperature you want.
click the link in my signature that goes to my write up on a sr20 radiator install, at the very last post, it should have a hayden part # for the fan controller
click the link in my signature that goes to my write up on a sr20 radiator install, at the very last post, it should have a hayden part # for the fan controller