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accessory circuit will generally be fine. Use an 18 AWG wire to ensure the system receives a
sufficient power feed.
*** Never connect any power terminal to a battery charger alone. The system 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
• Connect the TACH terminal to the ignition system
o 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.
o For GM HEI ignition equipped engines, connect to the terminal marked "TACH" or on some
systems, a single white wire with a spade terminal on it.
o On some aftermarket ignition systems, connect to the TACH output terminal.
o On computer controlled ignition systems, consult a service manual for the wire color and
location.
o With a magneto system, connect to the kill wire for the tach signal.
o If using a BIM-01-x module for the tach reading nothing will connect to this terminal.
• To ensure that the ignition system does not interfere with any other dashboard functions, do
not run the tachometer wire alongside any other sensor 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. Do not connect the TACH terminal to the secondary, or high
voltage, side of the ignition coil.
• 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 SGI-100BT. Be aware of the cylinder setting when using computer outputs or
reading the tach signal from an ECU. Some GM LS-based 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.
TACH WARN
• The TACH WARN terminal is an output to activate a small light or relay for a red-line or shift
indicator. The output is ground-activated when the preset warn RPM limit is exceeded. This
output can turn on a 4 Watt or smaller 12V bulb or can activate a relay to turn on a larger bulb
or buzzer. 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 TACH WARN terminal.
9
MAN# 650814
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