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I don't know if I would do it myself but yea just a air switch like one that is on the Deuce to engage the transfer case would be the simple way just to turning on and off the air to the fan.
Then the one you want is normaly open. Test the fan clutch by removing the air line that runs to it and with out air and it locks up then you will know what you need. Do believe it is 3/4 npt ask for 180*