This is a A-RE47793 Sensor, Engine Coolant Temperature PN: RE47793Main Description As Following : A-RE47793 Sensor, Engine Coolant Temperature PN: RE47793 Found in Section & Models : Engine Parts > Engine Related Parts, John Deere TRACTOR: 4050 (SN <001014), John Deere TRACTOR: 4250 (SN <001014), John Deere TRACTOR: 4450 (SN <001027), John Deere TRACTOR: 4650 (SN <324214), John Deere TRACTOR: 4850 (SN <322745), John Deere TRACTOR: 8450 (SN 001620>), John Deere TRACTOR: 8650, John Deere TRACTOR: 8850 Associated Items : New Also A-JD-O-OMRW16854, A-JD-O-OMRW16854 And : Replaces: RE37086, RE12184