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MAN# 650665:A
WIRING COLORS: (2003 and older HD)
MLX-2000 14-pin*
Stock harness color
Function
YELLOW
PINK or YELLOW/BLUE*
tachometer signal
PINK
BLACK/YELLOW
“ENGINE” indicator (-)
BLACK
BLACK
ground (connect directly to battery negative)
WHITE/BLUE
connected to function switch
WHITE
WHITE/GREEN
output speed signal (to stock TCM)
GRAY
WHITE
VSS signal
PURPLE
BROWN/VIOLET
security system indicator
WHITE/RED
+12v constant power
RED
ORANGE/WHITE
+12v with key on
WHITE/BLUE
connected to function switch
WHITE/BLACK
BLACK
VSS ground
WHITE/PURPLE
RED
VSS power
ORANGE
VIOLET
left turn ind)
GREEN
BROWN
right turn ind)
MLX-2000 8-pin*
Stock harness color
Function
BLUE
temperature sensor signal
BLACK
temperature sensor ground
PURPLE
WHITE
high beam ind)
WHITE/GREEN
TAN
neutral indicator(-)
WHITE/RED
SEN-1039 RED
pressure sensor power
GRAY
SEN-1039 WHITE
pressure sensor signal
BLACK
SEN-1039 BLACK
pressure sensor ground
BROWN
GREEN/YELLOW
oil warning indicator(-)
*To avoid damage to motorcycle, please consult a factory service manual for details on locating VSS, Tachometer,
and indicator wires. The above chart shows typical wire colors for most motorcycle applications
SPEEDOMETER
Failure to calibrate the speedometer may cause your odometer mileage to increase very rapidly.
The speed input connector plugs into the speed sensor to tell how fast you are traveling. On cable driven
applications, the external sensor connects to the speedometer cable and provides the electric signal. The sensor is
normally bolted directly to the bottom of the speedometer, but can also be remote mounted. The sensor has a 5/8” coarse
thread fitting that accepts mid-80’s and earlier cables directly. For newer cycles, the speedometer cable will need to be
replaced with one having the correct fitting.
For applications with an electronic speed sensor in the transmissions, a three-wire harness adapter connects the
transmission speed sensor to the speedometer. This system will also accept most aftermarket inductive, Hall-effect, or
ground switch sensors.
For three wire Hall-effect sensors, refer to the sensor installation instructions to determine wire color code. Most
three wire sensors use the following color code: RED – power, BLACK – ground, WHITE – speed signal. Connect the
sensor signal wire to the MLX-2000 main harness GRAY wire, connect the sensor power wire to the WHITE/PURPLE
wire, and connect the sensor ground wire to the WHITE/BLACK wire.
For a speed sensor integrated into a vehicle wiring harness, consult a service manual to determine the color code
and location of the speedometer signal. If the factory harness su5V to the sensor, connect only the GRAY
wire to the speed signal wire, leaving the other sensor wires intact.
The speedometer is fully adjustable and calibration is discussed in the Speedometer Setup section (page 11).
TACHOMETER
The tachometer is activated by connecting the yellow wire from the main harness to the negative side of the coil
or to an ignition module tach output. The tachometer is adjustable for 1 - 16 cylinder settings. The one cylinder setting is
used for single-fire ignition systems without a buffered tach output.
If there is not a pink wire attached to the stock gauge harness: for carbureted models connect to the pink wire to
the negative side of the coil and set the tach for 2 cylinders; for fuel injected models connect to either the blue/orange or
yellow/blue under the seat in the harness along the right side frame rail and set the tach for a 1 cylinder. For tach signals
integrated into a vehicle wiring harness, consult a service manual to determine the color code and location of the
tachometer signal.
