Getting a Phoenix P8 to chuff

I'm trying to figure out what to do to get chuffing with a Phoenix sound P8 decoder. It is in a Bachmann 4-6-0 (starter set engine) that I just put an Airwire P4 w/ battery in and using a T5000 controller. I didn't realize the Phoenix steam sound board did not have anything to trigger the chuffing. From another forum someone gathers that it's not in autochuff mode. From looking at the manuals it seems as if this is something that has to be preprogrammed in the board to do and I don't have a programming interface to do it. So... what combination of magnet/sensor/reed switch do people recommend for something like this and where do you get them? I'll probably put it on the tender wheels since that's where everything is. I've done a couple diesels but this is my first steam and don't have the knowledge a lot of you do. Anyway everything else is working good on it, just that when it's moving the engine sounds are just idling sounds. Let me know. Thanks!