See Part No. Free 360 Product Viewer from WebRotate360.com. i am collecting all of my bits to do this contour fan install and i have the fan, picked out and ordered the flexalite controller 33054 and is a vsc unit. Flex-a-lite 31163 Variable Speed Control Module with Threaded Temperature Sensor,Black It's capable of controlling two separate 35 amp fans at different turn-on temperatures, with only a single probe. ENTER. The second fan (if installed) will turn on 10 seconds after the first fan starts. Performance cooling products for the automotive market. Suggested Electric Fan Wiring Diagrams Converting a 12 Volt Switch into a Ground Switch These diagrams show the use of relays, ON/OFF sensors, ON/OFF switches and ON/OFF fan controllers. Fan Controllers. //