I just did this install on my TJ.
I take it you bought the inflate kit ?
The kit comes with a nipple that screws into the body of the pump (at the top). The air fitting with the flange screws into the top of the nipple, and the pressure switch screws into the side of the nipple.
Make sure you use some heavy duty teflon tape and some good pipe dope as I had a tough time making those fittings seal air tight.