I used a VW (80s Jetta) switch on mine, run through a 70amp relay and a large 40 amp fuse.
With the Taurus fan, I recommend wiring it up to the low side of the fan. I originally had it wired to the high side, but it was such a nasty start up, and really overkill for simple cooling purposes. I live in South Florida, and the low side on a stock rad keeps my car as cool as it needs to be. Another thing I noticed, it really seems like the low side of the fan has a slow start, where as the high side just KICKS on. Either way, I am very happy using the low side for cooling, and I am in the process of using a series of relays to hook up the high side of the fan to my AC, so basically it will work as it was supposed to. Low side for keeping the car cool, high side for blowing more air over the AC condenser.