1/8 NPT thread.

As far as I know a 1/8 NPT thread is a tapered thread so will need sealing with something. Does anyone know off the top of their head what is best to use to do this? Special sealer or teflon/PTFE tape?

Got all the bits for the fuel pressure sender so want to make sure its all put together correctly now.

I read that PTFE tape will react with petrol and turn gooey. What about Loctite (maybe a one time fitting though)
Petrol resistant:
http://65.213.72.112/tds5/docs/242-EN.PDF

I used PTFE tape, and have not had a problem so far.