US Shift Quick 2 GEN2 Installation And Operation Manual page 19

Engine RPM Signal Input
The engine RPM signal input on the yellow lead (pin 7) can be connected to a
digital tachometer output from an engine computer or the tachometer output
from an MSD ignition or similar CDI (Capacitive Discharge Ignition) system, but
NEVER to the coil outputs of a CDI system like MSD.
For breaker points (or conventional electronic ignition systems such as GM HEI,
Ford Duraspark or TFI), it can be connected to the coil negative terminal. For
this configuration, add the supplied 47K Ohm resistor (yellow, violet, orange,
and gold bands) to the yellow lead (pin 7) in-line with the tachometer signal. The
correct setting will need to be set in the tuning software under Settings>Speed
Sensor & Gearing.
For COP (Coil on Plug) ignition systems that do not have a conventional
tachometer output (such as later Mustang engines), one of the coil trigger wires
can be used, but the update rate will be slow. A better approach for such
applications would be to use a tachometer adapter such as the AutoMeter 9117.
DO NOT run the engine RPM signal wire in the same wiring harness as the
speed sensor as this can cause interference.
Overdrive On-Off Switch
The Overdrive switch can be used to turn overdrive on or off. The switch can be
a latching switch (toggle switch, latching push-button, etc.) or a momentary type
switch (spring-loaded push-button switch, spring-loaded toggle switch, etc.)
connected to +12v ignition-switched power and pin 4 (brown) of the vehicle
harness. (The tan wire on pin 12 is for VSS output and shouldn't be confused
with the brown wire on pin 4 for the O/D switch.) A momentary switch is needed
to use more than 2 states. Optionally, you can add an O/D indicator lamp
between +12v ignition-switched power and pin 2 (white) of the vehicle harness.
This lamp will normally light up when overdrive is off. Also, without adding a
switch, a single-click of the controller's knob can turn overdrive on and off. This
setting can be configured under the "O/D Control Switch" tab of the tuning
software. Whenever the O/D or manual state is changed, it will be reflected in a
change of the PRNDL indicator on the home screen display (e.g. PRNO21 will
change to PRND21 or PRN321).
To use an LED bulb for the O/D light (without built-in resistors for 12v), connect
the cathode (-) lead to the white wire on pin 2 of the vehicle harness and the
anode (+) lead to +12v ignition-switched power. Put a resistor in series on either
side. We recommend using a 1.2k Ohm resistor, but you can use one with a
lower resistance to make the LED brighter or one with a higher resistance to
make it dimmer. It's best to stay above 1k Ohm to protect the LED. A 1/4w
resistor or higher is recommended.
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