I am trying to locate the pressure switch on my furnace, any help would be appreciated.

You can go to this link and download all of the manuals: http://dl.dropbox.com/u/8010163/Goodman%20Manuals.zip

These should help you figure it out. Are you talking about the switch that proves the combustion air? If so, just follow the wires and you should find it. It's supposed to be down from fan.