An interesting thing about Ford gages that comes second hand. They are set to read what you may think is good regardless of the actual reading. For example the oil pressure gage may read mid range most of the time with it going slightly higher at higher rpm. In actualality it should read quite low at idle and progressively higher up to a max at some rpm. All that is required is an actual pressure greater than about 5-7 psi at idle to keep a code off or a light off and for the computer to continue to operate the motor. So in effect the gage was nothing better than an idiot light with a pointer.
This was well known with the Supercoupe cars beginning in '99. I had one and found this first hand after seeing a note regarding it. In fact there was an electrical fix that someone came up with that changed the way the gage read so it was more accurate.