Use nylon thread tape to install (if it doesn't have an O ring).
besides the oil leaking from the sensor is there any other way to find out this switch is bad?
thanks
From what ive seen if it was bad your low oil pressure light would be on but youd have good oil pressure. But to check you unscrew it and put a manual gauge set in and check pressure. If its good then replace the sensor and see if low oil light goes out.
JT