I'm interested in what you got there bossman. I used both DRAC and VSSB successfully when I was experimenting with them a year or two ago. I've got a pile of about a dozen of them altogether from various trips to the yard.

If memory serves me correct there are two VSS inputs on the VSSB one for VSS and the other for trans output speed? (Been a while since I looked at this so I can't remember exactly).