Installation manual

7
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.
Gauge is damaged. Return gauge for repair. (see instructions)
Gauge lights up, but displays Speed calibration is invalid Gauge must be recalibrated (see instructions).
“SPd” “Err”
Gauge lights up, but displays Tach calibration is invalid Reset cylinder selection (see instructions).
“tCH” “Err”
Gauge lights up, but displays Gauge is damaged. Return gauge for repair. (see instructions)
just “Err” 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 “255” 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.
Speed sensor voltage checks. All checks should be made with the sensor connected to the gauge and
the key on. Checks should be done with a volt meter and not a test light.
3-wire sensor: Red wire should have 9-11 volts dc, slightly less than battery voltage.
Black wire should show ground, 0 volts dc at all times.
White wire should vary between 0 and 5 volts dc as the gear teeth pass by the sensor.
2-wire sensor: Measure the voltage between the two sensor wires. With the wheel spinning the voltage should
be about 1-10 volts ac (make sure the meter is set to AC volts and not DC volts for this check).