Easy way to get at it is to jack and support the front passenger side of the car. Remove the tire and the splash shield that keeps you from seeing the back of the motor.
Here'* a picture of the sender. Nice thing about the 2000+ cars is GM used a regular hex head for the sender. Previous years it was a special socket to remove it. (pliers worked great). This picture is of a Regal drivetrain, your oil filter adapter will curl under the motor instead of sticking out to the right like this one. Sensor in the center of the picture is the one you want.