I'm working off memory as my turbine and extra tender are put away.
The only way this tender is going to work is to be connected by the tether to another loco. The die-cast CC turbine tender does not have pickup rollers. It derives it's power from the turbine locomotive. The tether provides all power and command control features to the tender. The Hall Sensor on the axle is what increases the dynamics of the turbine specific sounds as the speed increases- it does not chuff.
There may be a way to kluge it to work without the tether, but the work will likely be extensive. I'm not sure it's too practical because I'm pretty sure it's Railsounds 2.5 and the boards may be a one-off design.
Fred