Leaking 727 Transmission Neutral Safety Switch

The Awesome John Cope is sending me an original 727 neutral safety switch. Any tricks on installing? I assume all the fluid will drain out? Need sealant or Teflon tape on the threads?

Get *** end of the car nice and high and you'll minimize fluid loss. Don't use any sealer on the threads. It seals with a washer - make sure it's on there.