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APPLICATION #3 ()
Convert a high-speed signal found on newer GM transmissions down to a low speed signal to run a
speedometer, cruise control, or fuel injection computer.
These speed sensors have a two-pin connector on the transmission or transfer case. One of
the pins will be a ground and the other will be the signal. The ground pin will go to the GROUND
terminal along with the ground wire. The signal pin will go to the SIGNAL IN terminal. It is best to
twist the signal and ground wires from the sensor around each other. This helps eliminate any
electrical interference. If nothing else is connected to the speed sensor it does not matter which pin
is used as the ground. Connect the POWER terminal to accessory power. The output connections
will depend on your particular application. Here are some typical examples:
OUT3, 8000ppm AC:
OUT4, 4000ppm oc:
OUT5, 2000ppm oc:
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)
Speed input signal
Sensor 5V power (if needed)
most aftermarket speedometers and cruise controls
most TPI computers and some OEM cruise controls
most TBI computers and some OEM cruise controls
SGI-5 E
=
new Cal ratio
+
ppm values listed
below are only valid
after calibration is
-
complete
2000 ppm 'oc' output
4000 ppm 'oc' output
8000 ppm 'AC' output
6
MAN# 650528 rev. B
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