Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 83Get this manual
aSI Gauge Wiring Diagrams Tachometer Wiring Diagram
Tachometer dial on back side of case must be set to position number WIRING DIAGRAM A
Water Temperature Gauge
WIRING DIAGRAM Use this wiring diagram when using separate light switch for instrument lighting +12 Volt
light Switch
Position light Bulb to the Switched Position
Use this wiring diagram when using separate light switch for instrument lighting+12 Volt Light Switch Wire
Connecl lo Negative (-) Ground
Position light Bulb to the Switched Position
Connect 10 Tan lead Located at the Tachometer Receptacle on -' Commander Side Mount Remote Coolrol or Tan Lead Coming From Accessory IgnilionChoke Assembly