Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 86Get this manual
Multi-Function Guage Dip Switch SettingTesting
NOTE: The multi-function gauge "Dip must be set on the back of gauge prior to operationTurn the ignition switch to the "OFF' position before setting dip switchThe guage will reset to selected settings when the ignition is turned "On",
IMPORTANT: Test the gauge and related wiring BEFORE making finalDip Switchsettings and BEFORE securing the gauge to dashboard of boat1With the ignition switch in the "Off position, set the mutl-function gauge "Dip Switch" in (test) position as shown(Black dot indicates switch position)a Gauge Ughts (Red) Gauge LC.DBar Graph (Black)
Outboard Multi-Function Gauge Setting
Test Display (All)
Dip Switch Setting
275 hp Outboards (single engine)