Where is the oil sensor located? on 2007 Chevrolet Uplander

Low oil pressure light sporadically comes on & chimes but no loss of compression or smoke of any kind. Local parts store said it may just be a bad sensor. $22. Also gave me a diagram but I still can not locate the sensor. 3.9 V6 engine

Asked by for the 2007 Chevrolet Uplander
It will be on top of oil filter