SymptomPossible ProblemSolution
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 |
not show a reading. | connected to the control box |
| properly. |
| The speed sending unit being |
| used is not compatible with the |
| control box. |
| The speed sending unit is not |
| connected to the transmission |
| properly. |
| The sending unit wire is picking |
| up noise from nearby wires. |
Check that both speed sending unit wires are connected to the control box properly.
Use the speed sending unit supplied with the display system.
Check that sender is mounted properly.
Check that transmission has the appropriate internal parts.
Isolate the sending unit wire from motor and ignition wires.
The speedometer is reading too fast or too slow.
With the engine running and the vehicle sitting still, the speedometer reads higher than zero.
A display shows “EE”
The speedometer is not calibrated.
A tachometer wire is too close to to the speed sensor wire.
There is a ground problem between the speed sensor and the control box.
Sending unit for that gauge
is not connected to the control box.
Sending unit is not getting grounded.
On the water or oil, the sending unit is not the correct type.
On the fuel, the control box may be set for the wrong fuel sender.
Refer to the Speed Calibration section of the installation manual.
Reroute or isolate the tachometer wire away from the speed wire. Make certain the ground wire for the speed sensor is connected
directly to the control box ground.
Check the wire from sending unit to the control box for breaks.
Make sure that the sending unit is wired to the correct terminal.
Make sure the sending unit is grounded properly at the control box.
Use the water and oil senders that were supplied with the system.
Refer to “Fuel Setup” section of the installation manual to ensure that the settings match your fuel sender.
A display shows “- | The sending unit wire for that |
| gauge is shorted to ground. |
Fuel displays “FL” | The control box is set to an invalid |
| fuel sender setting. |
Repair or replace shorted wire.
Refer to “Fuel Setup”
section of the installation manual to ensure that the settings match your fuel sender.
28 | MAN 650066:D |
