MIDI Mapping for Jog Wheel

I’m starting to see the beauty in taking time to map third party devices in cubase but I’m stuck one function: I have an old Frontier Tranzport that I’ve been able to pretty much map as needed-except the jog wheel. I can’t figure out which mapping in Cubase to use to reflect when the jog wheel is turned left it’s a negative value and when turned right it’s positive-all in one mapping. I seem to have to pick one or other. Anyone have any idea?