Speedhut 3-3_8 inch, 4 inch, & 4-1_2 inch Speedometer - Manual

1.Disconnect negative (-) Battery Cable
2.Connect wiring as above.
4.Reconnect negative (-) battery cable.
Ground (black)
+12 volts Dash lighting (white)
(Black)
White wire speedometer
pulse signal. Acceptable
signals ranging from
1V-100Volts.
500 pulses -250K
pulses per mile.
Black wire (optional)
sensor ground.
If your Sensor has a
ground terminal,
hook up to black wire.
Snap connection
for dial lighting
+12 volts keyed ignition (Red)
(Black) Ground
(White) +12 volts Dash lighting
Power distribution cable to plug all gauges into
(green with orange)
(green with red)
(blue with white)
**left turn signal +12V pulse
**right turn signal +12V pulse
**high beam wire +12V
** Turn signals and high beam are an optional feature
3-3/8", 4”, and 4-1/2" Programmable Speedometer
INVERTER IS REQUIRED FOR GAUGE DIAL LIGHTING
Note: Tie both lighting white wires together
and both black ground wires together.
(Gauge Dial lighting)
(Main gauge power)
(Pointer (needle) lighting)
INVERTER
Note: Speedhut(G338) series
speedometers will have an 8' yellow
wire to connect to the speed sensor
instead of the black harness.
Purple wire loop: Cut this
wire if your pointer (needle)
is bouncing or is not
displaying a stable
reading. Cutting this loop
will clean up the electrical
noise coming from the
speed sensor.
Your speedometer will have a button on the front or a jack
button (button with 18" cable). This button is for programming
and operation of the gauge. We suggest mounting the jack
button in a convenient location for easy access.
3. Mount Gauge for easy viewing. Use spin lock ring (included) to mount to panel. Spin ring threads in both directions.
Snap white gauge connector to wire harness.
Optional Setup:
Speedometer Signal from ECU
Yellow/Black
ECU
Speed (Yellow/Red, Yellow/Green)
ACC (12v)
10K Ω 0.25 watt minimum
Power Draw = 0.2 Amp
5 Amp Inline Fuse Recommended
for +12 Keyed Ignition