Frank
I used a fan temp switch from an 82 sentra on my 69.5 maverick. It was cheap and fit behind the radiator. The nice thing about it was that if you want to mount it in front of your radiator you can change the dirrection of air flow thru the fan by reversing the power lead to the fan. I connected power to the fan thru the temp switch, this allows the temp switch to control the fan, you can use a relay if you want as well to control the fan, the temp switch turns on the relay which turns on the fan. Be sure to get the matching connectors from the donner to make wireing easier.
69.5mav