Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 115Get this manual
QSI Gauge Wiring Diagrams Tachometer Wiring Diagram
Tachometer dial on back side of case must be set to position number 4WIRING DIAGRAM Use this wiring diagram when using separate light switch for instrument lighting
Water Temperature Gauge
WIRING DIAGRAM Use this wiring diagram when using separate light switch for instrument lightingBlack
a 51106 Connect to12 Volt +12 Volt Light Switch Wire Position Light Bulb to the Switched Position Connect to NEGATIVE (-) Ground
Connect to12 Volt +12 Volt Light Switch Wire Position Light Bulb to the Switched Position Connect to NEGATIVE (-) Ground Connect to TAN Lead located at the Tachometer Receptacle on Commander Side Mount Remote Control or TAN Lead coming from Accessory IgnitionChoke Assembly
WIRING DIAGRAM Use this wiring diagram when instrument lighting is wired directly to the ignition key switch(Instrument lights are on when ignition key is turned on