I am having trouble with a water pump I just replaced. I took off the bad and put on a refurbished GRAF water pump, part # 102 200 50 01 The trouble I am having is that the old temperature sensor that came from the old pump does not fit in to the new pump. The threads on my old sensor are 14mm X 1.5, it seems that the new pumps threads are 18mm X 1.5 I called mercedes/dealer and they only have the same sensor for my year 190e (87) 14mm. Should I just get a different pump? I can't find an adapter of some sort that can join the smaller threads to the larger thread opening at this point that is metric, can someone please help??