i done it, well not a kenlowe, i used a pacet 16 inch fan and temp sensor in top hose, should realy be bottom hose as i want it to work determined on the temp of the water go in to the engine, not out of engine, BUT no space realy on 4.6 P38 bottom hose.
i used the adjustable switch and fiddled untill the temp gauge didnt realy move that much for fan to come on when stationary.
its a capable fan, very impresed and it fits directly onto the matrix of the radiator, only cooling the bit it touches but it does work very well.
i paid £240 for the whole lot from scorpion racing. prob available cheaper than that now!