How do you replace the oil sending unit wgauge on a 1996 Buick LeSabre Limited?

The sending unit is located just above the oil filter. Reach through the passenger side wheel well splash shield, remove it or just position it out of the way, and disconnect the connector. There is a special deep well socket you can purchase or just use a 27mm open end wrench as I did. There is enough room to get the wrench on the flats and turn the sending unit out from underneath the car. Reverse the procedure to install.