Low Oil Light on, need the part number for sensor

[99bluebird]

My Low Oil Light came on about 500 miles ago, and won't go back off. And no, my oil level isn't low. So I conclude it is the low oil sensor. However I am having trouble finding the part on gmpartsdirect. Can someone get me the needed part number. What is involved in the install?

[2001NBMZ28]

GM has changed the PN a few times - believe the latest one is 12603782. They're not expensive, with shipping/handling costs might be just about the same getting one at the dealer. Believe it just screws in after draining the oil. Check the wiring/connector first.