Vauxhall blue temp sensor, 90510183. Not metric (at least not std 10mm thread)
Fitted to all sorts
http://www.vauxhallworldparts.com/partsearch/partdetail1.php?partid=400

as I want to use with MS and need to eithre make or buy an adaptor.
Cheers
Clive

i want to lknow what the little sensor next to it is on the x20xev... i checked mine the other night. sure its metric, but i worget what. i'll check later

m14 fine so 14x1.5 or 3/8 npt

Thankyou!