Trimble 250 speed out advice

have a Trimble 250 which I want to link up to a new tulip fertiliser sower ( branded Teagle on mainland uk) to supply a gps speed input.

Looking at news ag talk forum I think I need something like this cable which plugs into the deutsch connector on the Trimble power lead and has a 7 pin connector on the other end similar to the one in the tractor of which the sower has the female end coming from the tulip control box.