Nitrous Q's, what is this?

[bush_basha]

hey guys, well i bought a second hand nitrous kit, and im looking at the wiring in tryna work it out how to wire it up but i have no idea what this part it is, its in a seperate loom to the solanoids, so its on the warming look, my thought was they are temperature sensors but wanting to make sure and wondering where they go, cheers

http://i277.photobucket.com/albums/kk71/bush_basha/DSC00326.jpg

no one knows what this is? is it temperature regulators??

anyone at all????