1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 81Get this manual

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Tachometer (With Adjustable Dial) and Trim Indicator Gauge Wiring Diagram
aTachometerPosition Dial to Point Toward "4"Trim Indicator Gauge (Optional)

dTachometerAccessories Harness

• • TGB
  • Arctic Cat
  • Bombardier
  • Can Am
  • Honda
  • John Deer
  • Kawasaki
  • Polaris
  • Suzuki
  • Yamaha
• • Kawasaki
• • Chrysler
  • Honda
  • Johnson Evinrude
  • Mercury
  • Suzuki
  • Tohatsu
  • Yamaha
• • Honda
  • Polaris
  • Sea Doo
  • Yamaha
• • Arctic Cat
  • Polaris
  • Ski Doo
  • Yamaha
• • Chrysler
  • Mercury
  • OMC
  • Volvo