650066
Symptom Possible Problem Solution
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incorrect. of the installation manual.
The speedometer will The speed sending unit is not Check that both 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 display
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 reading The speedometer is not calibrated. Refer to the Speed Calibration
too fast or too slow. section of the installation manual.
With the engine running and A tachometer wire is too close to Reroute or isolate the tachometer
the vehicle sitting still, the to the speed sensor wire. wire away from the speed wire.
speedometer reads higher There is a ground problem between Make certain the ground wire for
than zero. the speed sensor and the control the speed sensor is connected
box. directly to the control box ground.
A display shows “EE” Sending unit for that gauge Check the wire from sending unit
is not connected to the control to the control box for breaks.
box. Make sure that the sending unit is
wired to the correct terminal.
Sending unit is not getting Make sure the sending unit is
grounded. grounded properly.
Make sure the water and oil senders
have clean threads.
On the water or oil, the sending Use the water and oil senders that
unit is not the correct type. were supplied with the system.
On the fuel, the control box may be Refer to “Fuel Setup” section of the
set for the wrong fuel sender. installation manual to ensure that
the settings match your fuel sender.
A display shows “- -“ The sending unit wire for that Repair or replace shorted wire.
gauge is shorted to ground.
Fuel displays “FL” The control box is set to an invalid Refer to “Fuel Setup”
fuel sender setting. section of the installation manual
to ensure that the settings match
your fuel sender.
The fuel display reads The control box may be set for Refer to “Fuel Setup”
backwards, incorrectly, the wrong type of fuel sender. section of the installation manual
or does not change. to ensure that the settings match
your fuel sender.
The fuel sender may not be Check the connections at both
connected to the control box ends of the fuel sender wire.
properly. Make sure the fuel sender is
grounded properly.
The fuel sender may not be Check the fuel sending unit with
operating properly. an electrical multi-meter.
The fuel sender may have a Use the custom fuel sender setup.
non-standard resistance See the Fuel Setup section of the
range. manual for instructions.
(6 pages)
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