Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 131Get this manual
WIRING DIAGRAMS
NOTE: Refer to individual oil pressure gauge instructions for proper installation procedures for installing gauge in boat1InstaH LIGHT BLUE sensor lead to oil pressure gauge as shownNOTE: Normal oil pressure readings will be as follows: Outboard at normal operating temperature Wide-Open Throttle30-60 psi (207-414 kPa) Minimum Oil Pressure W.O.T- No Less than 10 psi (69 kPa) Oil Pressure Idle5-10 psi (34-69 kPa)