Innovate Motorsports SCG-1 - Manual (Page 5)

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3 Connect the WHITE wire to a headlight power wire (a wire that goes hot
with 12V when the headlights are on)). This enables the display to dim
for better nighttime viewing. DO NOT CONNECT THIS WIRE TO THE
HEADLIGHT DIMMING WIRE. Connection to this rheostat type of
switch will cause the gauge to malfunction. If you chose not to utilize the
dimming feature, connect the WHITE wire to ground.
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Optionally, the YELLOW analog output can be connected to the analog
input of other devices such as data loggers or ECUs. If this wire is not
being used isolate and tape it out of the way. The default analog output
configuration is 0V = 7.35 AFR and 5V = 22.39 AFR.
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Optionally, the PURPLE wire can be connected to a tach signal to log
engine RPM and to use the shift light function. A tach signal can be
acquired from the negative lead of a coil, ECU, negative lead of an
injector, or directly from the ignition box if running a multi-spark (i.e.
MSD 6AL).
Note: A tach signal can not be acquired from the negative lead of the coil
on vehicles running CDI ignitions. For these applications use the
negative lead of an injector or a tach adapter (if available for your model
ignition).
2.1.1 Single Innovate Device Relay Wiring Instructions