US Shift 4R70W Installation And Operation Manual page 21

The FLEX-SHIFT Settings window. O/D settings are at the bottom.
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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