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18 GHP 10 Marine Autopilot System Installation Instructions
Wiring the GHP 10 to the Tachometer
The tachometer connection is an important part of the GHP 10 system, and must be wired correctly for the autopilot to function. If
your engine supports NMEA 2000 engine data, and is connected to the same NMEA 2000 network as the GHC 10 and the CCU, then
no other tachometry wiring is necessary. For more information on the NMEA 2000 network, see page 21. If your engine does not
support NMEA 2000 engine data, then wire the GHP 10 autopilot system to the tachometer of your boat using the bare-wire portion of
the CCU/ECU interconnect cable. In most cases, this connection can be made behind the dashboard at the tachometer display. Refer
to the owner’s manual or shop manual for your engine to identify the color codes and location of the tachometer wiring on
your boat.
To wire the GHP 10 to the tachometer of your boat:
1. Identify the location and wire assignments of the tachometer (or tachometers) on your boat.
2. Route the bare-wire end of the CCU/ECU interconnect cable to the tachometer (or tachometers). If the cable is not long enough,
extend the wires with twisted pair, 22 AWG wire.
3. Use the Tachometer Wiring Table to determine the appropriate wires on the CCU/ECU interconnect cable. Connect the tachometer
wire or wires from the CCU/ECU interconnect cable to the tachometer sensor wire or wires from the engine ((or engines)). Connect
the ground wires to a clean ground.
Engine Conguration Tachometer Ground
Single engine Green and violet (twist together) White and grey (twist together)
Dual engines Port engine = violet Grey
Starboard engine = green White
Tachometer Wiring Table
NOTE: For three or more outboard engines, connect to the outermost port and starboard engines, according to the table.
4. Solder and cover all bare-wire connections.
Installing the Alarm Buzzer
The alarm buzzer audibly alerts you to important GHP 10 events. It must be installed near the helm station.
Mounting the Alarm Buzzer
Mount the alarm buzzer near the helm station. You can mount the alarm buzzer under the dashboard if you prefer. Secure the alarm
buzzer with cable ties or other appropriate mounting hardware (not included).
Wiring the Alarm Buzzer
Wire the alarm buzzer to the CCU/ECU interconnect cable.
To wire the alarm buzzer:
1. Route the alarm-buzzer cable to the bare-wire end of the CCU/ECU interconnect cable. If the cable is not long enough, extend the
appropriate wires with 28 AWG wire.
2. Use the Alarm Buzzer Wiring Table to make the appropriate connections.
Alarm Buzzer Wire Color CCU/ECU Interconnect Cable Wire Color
White (+) Red (+)
Black (-) Blue (-)
Alarm Buzzer Wiring Table
3. Solder and cover all bare-wire connections.