It was Echlin 6677. When I went down there, I took the car, brought a wrench and swapped the sensor out in the parking lot to make sure it worked right on the spot. Funny, but I had them call the manufacturer to give the calibration curve....i.e. X PSI gives Y ohms and it was the same as the junk Autozone and Oreillys senders made by Wells, but what I found when I broke out the multimeter was that the Wells units gave much higher resistance values than correct...65 psi was giving over 110 ohms and the gauge feeds off of 0-110 ohms, meaning that at just 65 psi, it was pegging the gauge full high.
The Echlin/Napa sender gave readings consistent with what the FSM called for and has been working fine since November when I put it in. Since I have the Delco spare on hand, it's pretty safe to say it'll never go bad.
Here's the link to the thread I had going about this issue a little while back....
http://zr1.net/forum/showthread.php?t=21648&page=2
It's worth reading from the beginning.
Chris