coolant sensor in intake manifold

so I send the wifey and kids out of the house so I could work on the car a bit (here in Michigan we don't do post season football)
I went to install the new intake manifold and in order to get some more wrenching room on one of the bolts I decided to remove the coolant sensor that sits on the front of the manifold
I get about a half a turn out of the darn thing and it snaps, leaving half of it in the manifold
ill take it in to work tomorrow to drill it out but I don't know what pitch to retap the hole once it is out

on a side note, do you guys usually remove the dowels when replacing the manifold ?
I could get it to slide on them no problem when dryfitting it but with the gaskets in place it gets tough to find them