Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 130Get this manual
WIRING DIAGRAMS
Multi-Function Gauge
Dip Switch SettingTesting
NOTE: The multi-function gauge "Dip Switch" must be set on the back of gauge prior to operationTurn the ignition switch to the "OFF" position before setting dip switchThe gauge will reset to selected settings when the ignition is turned "On"IMPORTANT: Test the gauge and related wiring BEFORE making final "Dip Switch" settings and BEFORE securing the gauge to dashboard of boat1With the ignition switch in the "Off" position, set the multi-function gauge "Dip Switch" in (test) position as shown(BLACK dot indicates switch position)