I picked up an oil pressure/temp gauge assembly (The part number on the box is F6MZ-10883-AA) from a Ford dealer who was selling his excess parts inventory on ebay.

I took it out to my test set-up that I was using to check for fake gauges, and this oil pressure gauge pegs high when I ground the "S" terminal. With a 20 ohm resistor, it's about at midpoint on the scale.

The next thing to do is install it in the car, change the sending unit, and see what happens.

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1997 Grand Marquis GS - Died
Now have a 2003 Grand Marquis LS