Oh - it's just forward of the oil filter (there are sketches of its location in the FSM - you should download that). Sorry - not sure what the thread is. I could guess, but that's no good.
Don't know the thread size off hand but it's right next to the oil filter. Since you have a 01 and a 3.2L I'm betting the car has a oil cooler so the sensor should be plain as day when you're looking for it.
3/8" thread. Standard pipe fitting size. If you have the oil cooler fitting, BE CAREFUL when removing the oil pressure switch from the end of it. Follow the FSM instructions.