4
TIMING GEAR TACH INTERFACE UNIT
SET
:
TGR
Convert a signal from an engine timing gear-tooth sensor to an ignition tachometer signal.
For using a standard 4-6-8 cylinder tachometer on a diesel engine, the DSL-1 E can convert a
timing gear sensor signal into an a standard gas ignition signal. Calibration is accomplished by
determining the number of teeth on the timing gear or using another tachometer as a reference.
Consult a vehicle service manual to determine the sensor color code and connection. The GROUND
terminal on the DSL-1 E should be connected to a good ground. The SIGNAL IN terminal will connect
to the timing gear sensor signal. Connect the POWER terminal to 12V accessory power. NORMAL
terminal will provide the standard signal to the tachometer. If your tachometer will not read from this
then try the HI VOLT terminal.
S
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IN
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DSL-1 E
+
-
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12V Accessory Power
GROUND
Sensor ground (not used)
Timing gear signal
standard tach output
1/2 rate tach output
high voltage tach output
jumper to HI VOLT output for some
early Toyota tachometers
Calibration
Adjust with engine running: To increase the tachometer reading, press and hold the + push
button switch. To decrease the tachometer reading, press and hold the - push button switch.
Preset or adjust: The calibration value (tooth count) can be set from 1 – 64.
1. Begin with the key off.
2. Press and hold the SET switch while turning the key on. The display will show the current version
code.
3. Release the SET switch. The display will show “
SEt
”.
4. Press and release the INC switch until “
tgr
” is displayed, then press and release the SET switch.
5. The display will show the tens digit of the currently stored calibration value. Press and release the
INC switch to set this from 0-6 for your desired calibration value.
6. Press and release the SET switch to move to the ones digit. Press and release the INC switch
until your desired value is shown.
7. Press and release the SET switch to save the ones digit and finish.
8. The display should now show the next menu option, “
SIG
”. Turn the key off.
