Electric Fan Suggestions.

If it will be your only fan I would put it on a relay controlled by a thermostat, something as simple as what hemied suggested or as elaborate as the spal controller http://www.spalusa.com/store/main.aspx?p=itemdetail&item=FAN-PWM-V3 keep in mind that the fan just mounted on the radiator will only pass air thru the area in front of the fan, you really should build a shroud around it, similar to 67gtx's one......