650066
Never connect this to a battery charger alone. It needs to have a 12 volt battery
connected to it. Battery chargers have an unregulated voltage output that will cause the system
to not operate properly.
GROUND
This is the main ground for the display system. A wire should be run from this terminal to
the vehicle’s main ground location at the chassis or engine block. Do not use the dash or a
dash support brace for the ground connection.
Use 18 AWG or larger wire to ensure sufficient grounding. Proper vehicle grounding is
extremely important for the gauges to read and operate correctly. The engine block should
have heavy ground cables to the battery, frame, firewall, and body. Failure to properly ground
the engine block or the control box can cause incorrect or erratic operation.
DIMMING
The gauges are designed to dim down when the headlights are turned on. This is to
reduce the display intensity at night so the gauges do not cause eye strain or reduced night
vision. Connect this to the tail light or parking light circuit so that it has 12 volts whenever the
headlights are on. When this terminal does not have power the display system will be at full
brightness. When power is applied, the display dims to an adjustable level. The night
brightness level is adjustable two different ways.
The default method is to have the system to dim to a preset level when the lights are
turned on. This preset brightness is adjusted in the setup menu “DIM”. See DIM ADJ for a
description of the second method.
DIM ADJ
The second method allows you to have a dash mounted control to vary the brightness
while the headlights are on. This requires a 10k potentiometer or Dakota Digital’s DIM-1 kit. A
stock headlight rheostat will not work. The dash mount dimmer has two wires, one connects to
the DIM ADJ terminal and the other connects to ground. The dash mount dimmer will only vary
the display brightness when the DIMMING terminal has power.
SPEED
The vehicle speed sensor (VSS) connects to this to tell the system how fast the vehicle is
moving. For two wire speed sensors, like the one Dakota Digital supplies with this system, the
polarity of the wires does not matter. Connect one wire to ground and the other to the speed
terminal. The speed sensor ground wire should be brought back to the control box to ensure a
proper signal is received. Twisting the ground and signal wires around each other provides an
additional level of interference protection. The speed signal wire should not be routed along
side ignition or other high current or high voltage wires.
For vehicles which already have a vehicle speed signal, tap into the VSS wire and
connect it to the speed terminal. You may have to consult a vehicle service manual or wiring
diagram to determine wire color and location.
This system can accept 4000 ppm – 128000 ppm speed signals. The sensor that Dakota
Digital provides is an 8000 ppm type. The speedometer is fully adjustable and calibration is
discussed in a later section. Failure to calibrate the speedometer may cause your
odometer mileage to increase very rapidly if the speedometer is reading too fast.
(6 pages)
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