In my Tuscan (4.0, Jan 02) it comes up behind the fuel tank and it is then wired into the main loom. You may need to lift up some of the carpets/dig behind the tank to find it though.
When i did mine on a 2001 tuscan, the old sensor had a connector on it. i cut the connector and connected it to the new sensor wire and just plugged it back in. Works perfect.