Sierra 18-5899 Oil Pressure Sending Unit for MerCruiser, Volvo, OMCSierra replacement oil pressure sender. Used on most types of marine applications on sterndrive and inboard engines. All Sierra aftermarket engine parts are manufactured to meet or exceed OEM requirements.Specifications: Sender Code "C"; Range - 80 psi; Thread Size - 1/8" - 27 NPT; Terminal Type - 10-32 stud; Use with 80 psi electric oil pressure gauge. Replaces: Crusader; 700425; MerCruiser; 815425T; 90806A; 34623; 90806; 815425; 8M0068784; OMC; 172127; 982650; 3853800; 3857532; Volvo; 3857532; Pro Marine; 65899; Redline; 5899; Datcon; 02504-00; Faria; 90512; Medallion; A-2547; Pleasurecraft; R02001; Stewart Warner; 279-A; VDO; 360 801; Veethree Seastar; lA15001; Volvo Penta; 3857532;