Troubleshooting guide.
Problem Possible
cause Solution
Gauge will not light up
Red wire does not have
Connect to a location that has power.
power.
Black wire is not getting
Connect ground to a different location.
a
good
ground.
Display is not connected to
Check cable between display and controller.
the
controller.
Gauge or controller is damaged. Return for repair. (see instructions)
Gauge lights up, but displays
Speed calibration is invalid
Gauge must be recalibrated (see instructions).
“ERROR” “SPD”
Gauge lights up, but displays
Tach calibration is invalid
Reset cylinder selection (see instructions).
“ERROR” “TACH”
Gauge lights up, but displays
Controller is damaged.
Return controller for repair. (see instructions)
just “ERROR” only
Gauge lights up, but speed
Speed harness is not connected Check 3 pin connector on the bottom of the
will only show zero.
properly to speedometer.
speedometer.
Speed harness is not connected Check connection from speed harness
properly to sensor.
to the speed sensor.
Speed sensor not grounded
Move ground to different location,
properly.
preferably close to speedometer ground.
Speed sensor is not being
Check cable connection at both ends
turned by the cable.
Sensor can be tested by spinning the
cable
with
a
drill.
Sensor is not sending a speed See speed sensor voltage checks listed
signal.
below.
Gauge is not calibrated
Gauge must be recalibrated (see instructions).
Speed reading is erratic or
Speed sensor wire is loose
Check all wire connections and inspect wire
jumps around.
or broken.
for breaks.
Cable is loose or broken.
Check cable between sensor and
transmission.
Poor ground connection.
Check ground connection on speedometer
and
sensor.
Speed reading is incorrect.
Gauge is not calibrated
Gauge must be calibrated (see instructions).
correctly.
Speedometer reads “199”
Gauge is not calibrated
Gauge must be calibrated using “auto cal”
while driving.
correctly.
(see instructions).
Gauge lights up, but tach
Yellow wire is not connected
Check connection from yellow wire to.
will only show zero.
properly.
tach signal wire.
Ignition
system
not
grounded
Check engine and ignition system grounds.
properly.
Gauge is not grounded
Check gauge and engine grounds.
properly.
Gauge is not calibrated
Gauge must be recalibrated (see instructions).
Tach reading is erratic or
Tach signal wire is loose
Check all wire connections and inspect wire
jumps around.
or broken.
for breaks.
Poor ground connection.
Check ground connection on tachometer
and
engine.
Tach reading is incorrect.
Gauge is not calibrated
Gauge must be calibrated (see instructions).
correctly.
Gauge remains dim at all
Brown wire is getting power
Connect brown wire to location that can
times.
all of the time.
be turned off during the day.
High beam, Left turn, or Right
Loose or incorrect connection
Check that the appropriate indicator wire has
turn indicator does not work.
to indicator wire.
about 0 volts when the indicator should be
off and about 12 volts when the indicator
should
be
on.
