MAN 650067:G
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GROUND
This is the main ground for the display system. A wire should be run from this terminal to
the vehicle’s main chassis ground
.
Use 18 AWG or larger wire to ensure sufficient grounding.
Proper vehicle grounding is extremely important for any gauges (or electronics) to
operate correctly. The engine block should have heavy ground cables to the battery, frame, and
firewall. Failure to properly ground the engine block or the control box can cause
incorrect or erratic operation.
POWER
Connect the POWER terminal to acc12V power from the fuse panel or vehicle
wiring harness. This terminal should have power when the key is on or in accessory position.
In addition to powering the display system, this is also where the voltmeter gauge reads the
vehicle electrical system voltage. The supply source should be a fused 5 - 20 amp circuit; the
system only draws about 1 amp, so sharing an existing accessory circuit will generally be fine.
Use 18 AWG wire to ensure the system receives a sufficient power feed.
*** Never connect the control box 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 and may cause damage to the control box.
TACH
Depending on the type of instrument system that you have, there may be a bar graph
tachometer, a digital tachometer, or both. Connect the TACH terminal to the ignition system.
On vehicles using a separate ignition coil, connect to the negative side of the coil. The negative
side of the coil will be the wire that goes to the points or electronic ignition module. For GM HEI
ignition, connect to the terminal marked “TACH” or on some systems, a single white wire with a
spade terminal on it. On some aftermarket ignition systems, connect to the TACH output
terminal. On computer controlled ignition systems, consult a service manual for the wire color
and location. With a magneto system, connect to the kill wire for the tach signal. Do not
connect the TACH terminal to the secondary, or high voltage side of the ignition coil.
To avoid having to locate a compatible connection, a Dakota Digital BIM-01-1 may also
be used with most 1996 or newer OBDII compliant computer systems to provide a tachometer
reading. When using the BIM-01-1, select “BUS” for the engine cylinder setting.
To ensure that the ignition system does not interfere with any other dashboard functions,
do not run the tachometer wire alongside any other sender or input wires. DO NOT USE SOLID
CORE SPARK PLUG WIRES WITH THIS DASHBOARD SYSTEM. Solid core ignition wires
cause a large amount of electromagnetic and radio frequency interference which can disrupt the
system operation.
The tachometer is compatible with almost all gasoline engines. The engine cylinder
selection, display update rate, tach signal type, and RPM warning point can be adjusted in the
setup menu under “TACH”. If a diesel engine is being used, you will need a tach interface, such
as Dakota Digital’s DSL-1 or DSL-2. Be aware of the cylinder setting when using computer
outputs or reading the tach signal from an ECU. GM LS engines require the tach to be set up
for a 4 cylinder, low voltage signal when reading from the ECU even though it is a V8 engine.
WARN
The WARN terminal is an output for a relay or small light. The output is ground-activated
when the preset RPM limit is exceeded. This output can turn on a 4 Watt or smaller 12 volt bulb
or can activate a relay to turn on a larger bulb. To wire a warning light to this output, connect
one wire from the bulb to 12 volt accessory power and connect the other wire to the WARN
terminal.
