After ignoring the leak in the wife's car for a few years

I finally tracked it down to a leaking oil pressure sensor. The oil is coming out of the end of the sensor, where it connects to the bullet connector. I ASSUME that this is not normal, but that end of the sensor is hollow, which seems strange. Can't find any mention of this sensor in the Haynes manual, short of one picture in the 'engine' section.
Any suggestions on replacements - is this a dealer item only?
TIA