Sierra 18-5897 Water Temperature Sender for Mercruiser, Volvo, OMC Water Temperature Sender for Mercruiser, Volvo and OMC 4cyl, 6cyl and Small Block V8 Engines using 38-18NPT. Thread Size 38 or 9.5mm -18 NPT Terminal Type 10-32 stud Range 240 DS Sender Code D Fits MCMMIE engines Interchangeable 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 385