Vince,

 I thought I would make a contribution.  Here's what I've come up
 with....

 GM Part number: 15239857. Used on GM full size utilities starting in
 MY07 and on GM full sized trucks starting in MY08.  AC Delco PN:
 213-3837.  I found the part on Amazon of all places,


 http://www.amazon.com/ACDelco-213-3837-New-Pressure-Sensor/dp/B001DXC11E


 for about $26 shipped.  At that link there is a list of all
 vehicles that use it.  The dealer list price is about $38.  The
 sensor is used on GM's returnless fuel system and has a range of
 100-700kPa.  The mating connector is a Delphi GT150 with a GM P/N of
 19115173.  I believe you can get connectors from Newark, but I could
 not find it on their web site.  I don't know what the factory pull
 down resistor value is, but may be able to find out if you need me to.

 Hope this helps.

 Heath

Finally, we're starting to get somewhere on Fuel Pressure Sensor
selection.  We've doubled the number of candidates over the last three
days.  :)
- MOTORCRAFT 3R3E-9F972-AA or 3R3Z-9F972-AA (previous email)
- AIRTEX Part # 5S7254 (below)

Any pointers for getting some kind of spec sheet/manual page/wiring
diagram/etc. for the two candidates?

*****

Heath's contribution sent me tripping on a second possibility - still
a Ford part though, and used in many models: Escape, Explorer, F150 -
F550, Focus, Freestar, Mustang, and more. (Safe to say it's "mass-
produced".)  AIRTEX Part # 5S7254, first picture.  I think it's a fuel
RAIL pressure sensor used under-hood (notice the manifold vacuum
port).  Pricy at ~$110 before finding discount outlets, but readily
available used.

A part I -DO NOT- think qualifies is the second picture, AIRTEX Part #
5S6080.  I believe this to be a fuel TANK pressure sensor -
essentially a MAP sensor - working at much lower pressures.  Used in
many Ford vehicles as well.  About $55.

Moral of this email: "Fuel Pressure Sensor" is ambiguous.  It needs to
be a fuel pressure sensor used on the wet, high pressure fuel rail.

Keep 'em coming.

Thanks,
-Vince Orton