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APPLICATION #1 ()
Recalibrate a high speed (32,000ppm – 250,000ppm) signal for an OEM speedometer or
engine/transmission computer. Do not use this unit to adjust a signal going to an anti-lock
braking system. Anti-lock braking systems may not operate correctly or behave erratically due to
the signal processing done to recalibrate the speed signal.
These speed sensors have a two-pin connector that plugs into the transmission or transfer
case. One of the wires will be a ground and the other will be the signal wire. The wires will usually
go up under the dash and into the speedometer, vehicle speed buffer, or engine/transmission
computer. The signal wire (signal high) will need to be cut so the SGI-5 can recalibrate it. The
sensor side of the wire will go to the SIGNAL IN terminal. The speedometer or buffer side will go to
the OUT1 terminal. If the speedometer does not operate correctly after installation of the SGI-5 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
Sensor 5V power (if needed)
GROUND
Sensor ground (if needed)
Speed input signal
=
new Cal ratio
SGI-5 E
+
-
calibrated 'oc' output signal
calibrated 'AC' output signal
4
MAN# 650528 rev. B
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