temp gauge sender, Help!!

[jezgod]

Me again, my temp gauge sender has no gone, the garge fitted a new one, which is calibrated wrong ( fans dont kick in till its reading 120 ) they tell me not to worry, it isnt really that hot. So i have told them i willbuy the part myself ( so it the right one lol ) Anyone know what part or part numbers or where from i am looking at? Many thanx Jez