Only way that could be an issue is if the PS32 board is mounted spaced away from the frame for clearance issues and the wiring run below the board. Or if the board was mounted on it's side with the wiring running behind the board.
Alan do you have a picture of how the board is mounted? I'd think on a DMIR Yellowstone there should be plenty of room to mount the board flat on the tender floor.
I've mounted all the boards on my steam locomotives to the tender floor and run the wiring over the top with no issues. But I'm working with large ATSF and SP tenders.