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APPLICATION #2 ()
Recalibrate a low speed (32,000ppm – 4,000ppm) signal for an OEM or aftermarket speedometer or
fuel injection computer.
Either two wire or three wire sensors can be recalibrated with this unit. Two wire sensors will
typically have one wire as a ground and the other as the signal. Three wire sensors will have an
additional power wire. You must first determine which wire is the signal. The signal wire will need to
be cut so the SGI-5 E can recalibrate it. The sensor side of the wire will go to the SIGNAL IN
terminal. The speedometer or computer side will go to the OUT1 terminal. If the speedometer does
not operate correctly after installation of the SGI-5 E you may need to switch to OUT2 instead of
OUT1. Connect the POWER terminal to a 12-volt accessory wire and connect the GROUND
terminal to a good ground location.
You can determine how far the speedometer is off by having it checked with radar, a GPS unit,
or following another vehicle going at a set speed. Once you know how far it is off at a certain speed,
you can use the push button switches to adjust the speedometer while you drive or use the following
equation and then follow the instructions for calibration preset on page 3.
Actual speed
------------------------------- x current Cal ratio
speedometer reading
12V Accessory Power
GROUND
Sensor ground (if needed)
Sensor 5V power (if needed)
Speed input signal
=
new Cal ratio
SGI-5 E
+
ppm values listed
below are only valid
after calibration is
-
complete
calibrated 'oc' output signal
calibrated 'AC' output signal
5
2000 ppm 'oc' output
4000 ppm 'oc' output
4000 ppm 'AC' output
MAN# 650528 rev. B
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