It depends on the controller used. It will have instructions for the location of the sensor (inlet or outlet). I have a Delta Current Control on my Mustang. They are very good controllers but receiving one takes a long time. I know a a lot of Mustang guys are using Flex A Lite controllers. Do a search on corral.net forum for fan controllers
2003 TJ, 33" BFG AT, 2" BL, 2" BDS spring lift, Truck Lite headlights, Homemade sunrider top.