Series II
ODYR-02-7 & SLX-02-7 MINI TACHOMETER
Introduction:
The Odyssey Series II gauges from Dakota Digital, Inc. incorporates the reliability and quality of
our standard gauges, along with several unique features and easy mounting. These features include:
•
Industry standard 2-1/16” gauge size.
•
250-18,000 rpm range with 10 rpm resolution. (100 rpm res. above 10,000)
•
Adjustable cylinder selection (1-15).
•
Adjustable warning point to flash the gauge readout.
•
High rpm recall.
•
Microprocessor stabilized readings.
•
Night dimming with lens label lighting.
•
Non-Glare, high contrast lens
•
High Visibility VFD display for sunlight readability.
WIRING COLOR CODE FOR GAUGE:
RED
+12 volt power with key on
BLACK
ground for gauge and case
(the ring terminal should attach to the top screw on the case.)
GRAY
tachometer signal input
WHITE/RED
optional tach pull-up for computer tach signals
GREEN switch input
BLUE
night
dimming
POWER
Connect the red wire from the main harness to accessory power from the ignition switch.
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
The black wire is the main ground for the gauge. A poor ground connection can cause improper
or erratic operation. The black wire loops over to the top screw on the back of the case. This ensures a
good case ground connection.
TACHOMETER
The gray wire connects to the vehicle tach signal. On point type and pointless distributors
connect to the negative side of the coil. This will sometimes be labeled TACH or DIST. On
distributorless ignition systems, connect to the tach output wire or to the negative wire of one of the coils.
On MSD ignition systems connect to the tach output terminal.
For tach signals integrated into a vehicle wiring harness, consult a service manual to determine
the color code and location of the tachometer signal. The tachometer signals from some engine
computers require a weak 12 volt pull-up for correct operation of the gauge. Tie the gray and white/red
wires together if this is needed.
The tachometer is adjustable from 1 to 15 cylinder signals and calibration is discussed below.
Diesel engines will usually require a diesel tach adapter DSL-1 or DSL-2, available from Dakota Digital,
Inc.
The gauge displays the engine rpmx10 from 250 – 9990 and rpmx1000 for 10,000 – 18,000.
2500 rpm would be displayed as “250” and 11,400 rpm would be displayed as “11.4”. The decimal point
indicates the reading has changed from rpmx10 to rpmx1000.
The gauge can be set for a slow update, which changes the displayed reading every ½ second,
or for a fast update, which changes the displayed reading every 1/8 second. The slow update rate is
recommended for most applications since rapidly changing numbers can be difficult to read.
