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Wow, that site is awesome. I've found they also have the 5.4 on there too. Will definitely be digging into this.
Tests NC: Ignition Engine Speed Input Circuit — 2004 Ford Truck Expedition 2WD V8-4.6L SOHC VIN W Service Manual | Operation CHARMDetailed repair manual for the 2004 Ford Truck Expedition 2WD V8-4.6L SOHC VIN W.charm.li
This is for an 04 Expedition with the 4.6....but it may help. It is for a P0320 code and how to pinpoint, etc.