Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 112Get this manual
Oil Level Gauge Wiring Diagramd c-BLU BLK
aTo 12 Volt SourcePURPLE Wire (Connect to Trim Indicator Gauge "I" [or POSITIVE (+) 12 Volt Source that is Turned "ON" and "OFF" with Ignition Switch])Oil Level GaugeBLACK Wire (Connects to NEGATIVE Ground)To GroundBLACK Wire (From Gauge to Oil Clip Connector)LIGHT BLUE Sender Lead to GaugeWiring Harness (LTBLUand BLACK)Screw (10-16 518 inSpringOil Clip ConnectorScrew (10-16 14 inSpringScrew (10-16 518 inBLACK Wire 90-855348 JUNE 1997