How to convert the model to "scale".
The three wires coming out of the cab are: common, rear headlight, and cab light.

Self-tapping screw for contact strip.

Below are the instructions for installing the Soundtraxx Tsunami (first-generation) into this locomotive. The article was written by Bill Clark and made available by Don Thompson.
These are the recommended CV settings with which the models were configured, provided by Don Thompson: Tsunami Configuration Variables (CV) Settings.
External link about Installing a Lenz Gold decoder.
External link about Installing a Lenz Gold & SoundTraxx DSX Decoder.
External link about How to install battery power with S-CAB.