Tom,
Yeah, I'm still here -- but it sounds like your sensor has gone south. To be sure, you can test the system and isolate the fault by clipping a resistor across the cable leads (in place of the sensor) as per my procedure above.
In terms of sourcing a replacement sensor, you'll need a large electronics supply house. I suggest using your yellow pages and phoning around -- you may find a source with a cash counter and no minimum. Otherwise, you'll have to order from somewhere like Digi-Key (digikey.com). The problem with mail order is that you'll pay several times the cost of the part for handling and shipping.
If there's sufficient interest among all the folks with dead sensors, I'd be glad to order a quantity and supply as needed. Or maybe PartsShop would do the same?
Good luck, and let me know if you any questions along the way.
Barrie