Hey Stick,
Check out the currently active thread: "Is there a way to turn on my fogs with the high beams" (or something close to that). 92Tripleblack had a real good idea involving a relay which should work for you. (I would attach the thread link but I am not sure how to perform this advanced maneuver!!!)

 

Here you go, David:

Is there a way to make my fog lights go on with High Beams?

 

I would use a relay to power your aftermarket fogs (in the manner described in the other thread). You can get power at the positive accessory terminal of the battery. You should use an appropriate fuse and wire gauge depending on how many watts your fog lights draw.

http://www.powerstream.com/Wire_Size.htm

As far as the switch, you can use one of the switch blanks at the lower left driver's side dash panel. I think some people use an OEM switch for a pathfinder that will pop into the hole occupied by the blank. If you want to use an aftermarket switch, you could just drill the switch blank. The triggler lead from the switch to the relay can be fished through the hood latch release cable grommet with a coat hanger.

I would switch the trigger lead of the relay to a wire that is only hot when the ignition is turned on, so that I wouldn't accidentally leave the fogs on and run the battery down.

By switching the trigger lead, you have independent control of the fogs and can turn them on and off as you please, regardless of whether the headlights are on or off.

On the pathfinder switch, check post #8 in this thread:

http://www.titantalk.com/forums/showthread.php?t=17964&highlight=pathfinder+fog+switch