1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 52Get this manual
Pu Ie Jumper TACHOMETER TRIM INDICATOR GAUGE ALARM HORN
a GNO Black Jumper Black Purple
Purple Bro wnlWhite
PLUGConnect 10 Control BOlt or Eng ine Wiring Harness
Tachometer (Without Adjustable Dial), Trim Indicator Gauge, and Alarm Horn Wiring Diagram
Purple Jumper
Black Jumper
TA CHOMETER TRIM INDICATOR GAUGE ALARM HORN