COMPUSHIFT II can use an engine temperature sensor as part of the shift and pressure control system. If you are using an engine management system that includes a temperature sensor, then you can use that sensor for COMPUSHIFT II.
In that case, your temperature sensor is already biased (powered), and you should set the Engine Temp Sensor Bias to Off.
If you are using an engine temperature sensor solely for COMPUSHIFT II, then you should set the Engine Temp Sensor Bias to On.
Engine Temp Sensor