Changing out temp sensor?

[Rockstar]

Very simple question, i found out my temp gauge works by testing the ground and it pegged the needle so im going to change the sensor. Once i unscrew it is fluid going to end up pouring out or not? and should i change the plug end out or will it be fine. Do i need to put teflon tape on the threads? Thanks

 

[Jim Rockford]

no tape ,it needs to ground ,and if your quick you can minimize any fluid loss.

 

[Rockstar]

Ok cool thanks!