OK, really confused now.
That sure looks like an MTH setup, so are you running DCS Protosound III and then using feeding from the railpro to the DCS hardware, or did you drive the motor directly?
The question was about chuff synchronization, and using the chuff input on the railpro board, but it does not appear you could be doing that, since MTH hardware uses the tach strip to synchronize chuffs.
Can you explain your setup please?
Greg