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