DT-30SN SERIES SENSOR INSTALLATION INSTRUCTIONS
These instructions cover all the sensors that can be used with Digatron instruments. Some may not pertain to your particular model.
Do not operate your instrument unless all the sensors are connected. Inputs that are left open can cause erratic display readings
and possible instrument damage. Unused instrument inputs must be terminated at the back of the instrument with a shorting plug
available from Digatron.
POWER HARNESS
SN-LCHBN:
Your instrument receives it’s power and tach
signal from the lighting coil. Install the harness in the following
manner.
Splice the red lead of the lighting coil harness directly into the
lighting coil wire before the regulator using one of the “set
screw” wire connectors provided. Connect the other lead of the
lighting coil harness directly to the engine block.
Route the connector end of the harness to the instrument and
plug it into the pigtail with the
black
boot
. Twist the connector
¼ turn to lock it in place.
NOTE
:
Do not use the large white pigtail with the
gray
boot
, it
is an EGT input.
REMOTE STORE
SA-CBN:
The remote store switch should be mounted to the
handle bars within thumbs reach of the driver. This switch
requires a 15/32
"
mounting hole for installation. You will need
to fabricate a mounting bracket for the switch. Mount the
bracket to the handle bar in a position that will provide easy
access to the switch while driving.
Tie the coil cord to the steering column where needed to
prevent it from interfering with the driver.
Connect the cord to the pigtail with the
white
boot
on the back
of the instrument. Twist the connector ¼ turn to lock it in place.
CABLE ROUTING NOTES
This section applies to the sensors that run from the engine
compartment to the instrument. These sensors should always
be routed as far away as possible from the ignition system
components (plug wires, spark plugs, ignition coils, distributor
or magneto). Sensor cables too close to these components 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.
When routing sensor cables through any panels, be sure to
use a rubber grommet to keep the cables from being cut by a
sharp edge.
If you experience erratic readings after installing your
instrument, it is usually helpful to separate individual sensor
cables as much as possible. In particular if your sensor cables
are too long, coil the excess cable of each sensor separately.
EGT SENSOR
EXT-172RBN:
Install the sensor clamp assembly on the
exhaust header. Position the clamp so that the sensor will be in
the center of the header and approximately 2
"
from the head
side of the exhaust flange.
Using the fitting on the clamp assembly as a drill bushing, drill
a 3/16
"
hole through the header. Remove the clamp assembly
from the header and redrill the hole to 13/64
"
. Reinstall the
clamp assembly aligning it with the hole just drilled.
Insert the EXT-172RBN sensor into the fitting so that the tip of
the sensor extends ¼
"
past the center of the header. Tighten
the compression nut to lock it in place. Connect the black wire
to any clean, unpainted metal surface on the engine (it is
important that this is a good electrical connection).
Route the sensor cable from the motor to the instrument.
Secure the cable with cable ties to prevent excessive
movement.
The thermocouple cable is brittle and will break at
the flex points if not properly tied down.
It is also a good
practice to protect the cable with a short piece of fuel line at
any point that it may rub against a hard surface.
All EGT sensors use a
gray
boot
on their connectors. If you
have more than one EGT sensor, you might want to use a
permanent marking pen on the boot to identify individual
sensors. Connect the sensors to the pigtails with the
gray
boots
and twist the connector ¼ turn to lock.
WATER TEMP. SENSORS
WT-***BN:
Water temperature should be taken from a point
well below the water level in the block, or from a fitting
provided for this purpose in the head (do not use the radiator).
The compression fitting provided with the sensor is an 1/8
"
NPT. You may need to use a reducing bushing in some
applications to adapt the compression fitting to an available
water temperature port.
When installing the sensor, be sure
that at least 1
"
of the probe is in the water.
Route the sensor cable to the instrument and attach the cable
to the
red boot
. Twist the connector ¼ turn to lock.
CHT SENSOR
SS-102:
Only air cooled engines use this sensor.
Remove the spark plug from the cylinder you wish to monitor
and discard the plug washer.
