Thread sealant on brake switch?

I'm installing a new brake light pressure switch on a new M/C. Should I use teflon tape, teflon pipe dope or regular pipe dope as a thread sealant or nothing at all? Didn't see any sign of sealant on old switch. I know there's no need on flare fittings but wasn't sure about pipe thread connection. :?

 

That tefllon tape will break down when brake fluid hits it, so dont use it. Was there a little brass washer on the old one?? If so I would get another new one. If the original didnt have anything on it, I guess just screw it in and call it good.

 

Dan that sealant is tough to find, we used to get it for our water fittings on our molds. It came in a spray can when we found it.
Here is a link to the type thats on the speed bleeders, its at the bottom of the page.http://www.dirtwerkz.com/Pages/products/brakeaccessories/speed_bleeder.html

it is available from the speed bleeder website for $10 for a 1/2 oz bottle.

 

When I replaced the stop light switch I didn't use anything and it doesn't leak.