LIGHT
FUNCTION
POWER
SETL
MAX READING
Introduction
The DT-45SNL is Digatron’s small, easy to use, digital engine monitoring system. This instrument was
designed for the customer who wants to know how their engine is functioning without spending a lot of time
and money. This instrument monitors tachometer (Tach), with backlight and limit to warn you of possible
engine problems.
Installing Your Tach Sensor
The DT-45SNL will only operate if the sensor is connected and your engine is on. The sensor cable should
always be routed as far away from the ignition system components as possible (plug wires, spark plugs, ignition
coils, distributor or magneto). If the sensor cable is too close to these components it may pick up radiated
electrical interference and cause erratic instrument readings and operation. A distance of at least 6
"
from these
components is desirable in all installations. If your cable is too long to route back to your instrument fully
extended, we recommend sending it back to Digatron to be cut to the appropriate length for your needs. You
can also coil your sensor, but keep the coil away from the engine.
Your instrument receives it’s power and tach signal from the lighting coil. To install the power harness, splice
the red lead of the harness directly into the lighting coil wire before the regulator using the wire connector
provided. Connect the other lead of the harness directly to the engine block. Route the connector end of the
power harness to the instrument and plug it into the pigtail with the
black
boot.
When routing the sensor cable through any panels, be sure to use a rubber grommet to keep the cables from
being cut by a sharp edge. It is also good practice to protect the sensor with a short piece of fuel line at any
point that the cable may rub against a hard surface.
The Two Modes of the DT-45SNL
This instrument has two basic modes of operation, Set Limits and Monitor.
A.
Set Limits mode is necessary before using your unit for the first time and if you use it on different engines.
Limits help you prevent possible engine damage.
B.
Monitor mode is used while operating your snowmobile to watch your engine RPM for irregular activity.
A. Setting the Function Limits On Your DT-45SNL
Before using your DT-45SNL be sure to set the Tach operating limit and calibration number. These allow the
instrument to give you a visual warning (the display flashes) if the input exceeds it’s limit.
The limit should be
set at a level that allows you to react to the visual warning before engine damage occurs.
Enter Set Limits mode by pressing the
SETL
button. The instrument is now in Set Limits mode, which is
indicated by the flashing display.
•
To change the number being displayed press the
←
or the
→
button. Hold either of these buttons down and
the number will change faster.
•
When you are finished setting the tach limit, press the
Function
button to set the Tach calibration number.
•
To save the Tach limit and calibration number and return to Monitor/Record mode, press the
Function
button.
The Tach limit is the maximum revolutions per minute (RPM) for safe engine operation. The Tach calibration
number is used to display the correct RPM for different engine types The instrument divides the Tach input
signal by the Tach calibration number. This number can be between 1 and 16.
The most frequently used numbers are:
2 cylinders - set at 2 or 4
3 cylinders - set at 3 or 6
4 cylinders - set at 4 or 8
