52
MAN# 650814
Symptom
Possible Problem
Solution
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The tachometer reading The tachometer signal wire is
Check the connections at both
is incorrect.
loose or broken.
ends of the wire.
The engine cylinder setting is
Refer to the tach setup section
incorrect.
of the installation manual.
The speedometer will
The speed sending unit is not
Check that all speed sending
not show a reading.
connected to the Control Box
unit wires are connected to the
properly.
Control Box properly.
The speed sending unit being
Use the speed sending unit
used is not compatible with the supplied with the instrument
Control Box.
system.
The speed sending unit is not
Check that sender is mounted
connected to the transmission properly.
properly.
Check that transmission has the
appropriate internal parts.
The sending unit wire is picking Isolate the sending unit wire from
up noise from nearby wires.
motor and ignition wires.
The speedometer is
The speedometer is not cal
’d.
Refer to the Speed Calibration
reading too fast or too
section of the installation manual.
slow.
With the engine running A tachometer or ignition wire is too Reroute or isolate the tachometer
and the vehicle sitting
close to the speed sensor wire.
wire away from the speed wire.
still, speedometer reads There is a ground problem between Make certain the ground wire for
higher than zero.
the speed sensor and the control the speed sensor is connected
box.
directly to the Control Box ground.
A display shows “OPEN” Sending unit for that gauge
Check the wire from sending unit
or “FAIL HIGH”
is not connected to the control to the Control Box for breaks or damage.
box.
Make sure that the sending unit is
wired to the correct terminal.
Sending unit is not properly
Make sure the sending unit is
grounded.
grounded properly at the Control Box.
On the water or oil, the sending Use the water and oil sensors that
unit is not the correct type.
were supplied with the system.
On the fuel, the Control Box may
Refer to “Fuel Setup” section of the
be set for the wrong fuel sensor. installation manual to ensure that
the settings match your fuel sensor.
A display shows
The sending unit wire for that
Repair or replace shorted wire.
“SHORTED” or
gauge is shorted to ground.
“FAIL LOW”
On the oil, the sensor power
Make sure the RED wire from the
wire is broken or not
oil pressure sensor is connected
connected.
to PRESSURE INPUT
– PWR.