Sierra 18-5897 Water Temperature Sender for Mercruiser, Volvo, OMCWater Temperature Sender for Mercruiser, Volvo and OMC 4cyl, 6cyl and Small Block V8 Engines using 3/8"-18NPT. Thread Size: 3/8" or 9.5mm -18 NPT; Terminal Type: 10-32 stud; Range: 240 DS; Sender Code "D"; Fits: MCM/MIE enginesInterchangeable with: Mallory; 9-42400; Medallion; A-2618-3; Mercruiser Stern Drive; 22-811091; 36525; 806490; 806490T; 97257; 97257A1; OMC Stern Drive; 3853787; 980613; Stewart Warner; 352BC-D; Veethree Seastar; 52320S018; Volvo Penta; 3853787;