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TACH
Depending on the type of 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 equipped
motors, connect to the terminal marked “TACH” or on some systems, to a single white wire with
a spade terminal on it. On MSD ignition systems, connect to the TACH output terminal. On
computer controlled ignition systems consult a service manual for the wire color and location.
GM LS1 engines require the tach to be set up for a 4 cylinder, low voltage signal. With 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 ensure that the ignition system does not
interfere with any other dashboard functions, do not run the tachometer wire along side 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 then you will need a tach interface,
such as Dakota Digital’s DSL-1 or DSL-2.
WATER
The water temperature sender included with this system must be used. Other senders
will cause incorrect readings. The sender mounts on the engine block or into the intake
manifold so that the end of the sensor is in the engine coolant flow. The sender gets its
electrical ground connection to the engine block through its threads. Do not use Teflon tape or
thread sealant on the sender threads. Doing so can cause incorrect readings or cause the
gauge to display an out of range indication. A sender with 1/8 NPT thread size is normally
included along with adapters to go to 1/4, 3/8, and ½ NPT. If the engine you have requires a
metric or non-standard thread size you can contact Dakota Digital for availability or check your
local auto parts dealer or hardware store for an adapter.
A single wire should be run from the terminal on top of the water sender to the control
box terminal marked WATER. If your wiring harness already has a wire routed through the
vehicle for the water temperature then it may be used. Do not route the water sender wire along
side a spark plug wire or other high current or high voltage wires. Doing so can cause incorrect
or erratic gauge readings. If the temperature exceeds an adjustable warning point the reading
will flash as a warning of high temperature. The default warning point is 250°F.
If the water display shows “---“ this indicates that the control box is sensing a short to
ground or out-of-range error from the sender or sender wire. If the water display shows “EEE”
this indicates that the control box is sensing an open circuit or out-of-range error from the
sender or sender wire. If either indication remains on the display, inspect the sender wire for
damage, check the routing of the sender wire, check the sending unit grounding, and check that
the correct sending unit is connected. The sending unit should be stamped with “VDO” and
“150°C”.
Replacement sender part numbers are:
Dakota Digital VDO equivalent
1/8” NPT SEN-04-1 323 057
3/8” NPT SEN-04-2 323 059
½” NPT SEN-04-4 323 060
12mm SEN-04-6 323 092
(6 pages)
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