the only thing that I'm unsure about is ,which are the wires that come from the engines optical sensors on the cylinders for the chuff ?. I need to know the color so I can reroute them to the phoenix. sorry if this seems simple to some folks ,but I"am a newbie in the electronics field.
The optical sensors in the K-27 don't work all that well. You are better off to put magnets on the the tender axle and use a reed switch. By the way I'm a revet counter and I gave up and used the read switch method and it works great.
The rest of the story on the optical chuff:
http://www.bachmanntrains.com/home-usa/board/index.php/topic,4021.0.html