RAC Plus User’s Manual
2-6
The number of pulses per mile from
a vehicle will vary with the make
and model. Your calibration factor
should be between .500 and 1.200.
If not, adjust the rotary switch then
recalibrate to reach a calibration
number within this range.
Note: If the speedometer does not
respond to vehicle movement, sim-
ply reverse the RED and BLACK
wires to correct polarity.
Most vehicles should have a 2-wire output from the VSS.
Dodge & Ford trucks may have the VSS located on top of the
rear end housing instead of at the transmission. It will normally
be a 2-wire output, small gauge wire.
Connect the red and black wires of the long 20’ VSS cable to
the wires from the vehicle’s speed sensor. Crimp-on tap splice
connectors are supplied for convenience on initial installation.
However, we recommend removing the tap splice connectors
and reconnecting using wire to wire solder once you are sure
all connections to the VSS are proper. Insulate with sealant/
electrical tape as needed.
Fig. 2.6 –MDS Installation Diagram
Vehicle Speed
Sensor (VSS)
Fire
Wall
Fire
Wall
Tap Splice
Connectors
Battery
RAC Connector
Fuse
Ground Black
+12 VDC
Red
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