Question about chuff sensor

[henninck]

Hi, I am planning to connect the Chuff sensor board of my 2-6-6-2 to my Uhlenbrock Intellisound modul.
The question is, which voltage the chuff sensor-board needs. The Uhlenbrock has connectors for GND 3,3V and input. Is it possible to just take the chuff signal from the mainboard? Or do I have to rewire the complete system? As far as I know, I need the signal - . Is the Signal the board gives - or + ?

Thanks for your help

Jan