What size bolt/plug fits my block?

["Turbo-T"]

I'm getting ready to remove this water temp sensor from my block on the drivers side and was wondering if anyone knows what size bolt/thread count I need to go purchase?

Thanks.

 

[1000MileStylez]

i think its 1/4 npt, dont qoute me on that

 

[disco stu]

1/8 Npt

 

[ronbuick]

What disco said.

Ron