6
MAN#650508B
FUEL GAUGE GROUND UPDATE
The gauge system ground (black wire from the three pin speed connector) will normally connect to the stock fuel gauge
connector (middle spade socket). On some models the factory grounding can cause errors in the fuel gauge reading. In
order to correct this, a ground extension harness is included in your kit. It has a long wire to go to the fuel sender with a
spade connector on the other end. The speedometer ground wire will connect to this extension wire instead of going to
the fuel gauge connector. The other end of the long ground wire should be routed under the tank and connect as close to
the fuel pump connector as possible. Locate the three or four wire harness going to the fuel pump and fuel sender
connector near the gas cap (shown below). The new fuel gauge ground should be attached to the black ground wires on
this harness. Three wire harnesses will have one black wire and four wire harnesses will have two black wires, connect to
the black ground wire in position C (3
rd
location). Soldering and covering with heat shrink is the preferred method for
attaching the ground wire but a properly used butt connector will also work. Scotch lock style connectors are not
recommended.
Strip back the insulation on the black wire.
Wrap the end of the new fuel gauge harness around the
exposed wire.
Solder the connection, making sure the solder flows into the
wires.
Wrap the splice with electrical tape to insulate it.
TO SENSOR
TO TACHOMETER
TO OIL PSI HARNESS
Oil Temp Sensor and Harness
BLACK WIRE TO FUEL GAUGE CONNECTOR BLACK WIRE
YELLOW WIRE TO FUEL GAUGE CONNECTOR YELLOW WIRE
TO SPEED 3-PIN CONNECTOR
BLUE WIRE TO AIR TEMP CONNECTOR BLUE WIRE
Interconnect Harness
Connects to each gauge
Sensor Connect Harness
