Thanks Eldon

You know I was looking at that pic and the pins for the G540 in the manual right after I posted it, and after about 10 minutes I came to the same thing you just posted. You know the light bulb came on type of thing
Just having those few extra words it makes so much more sense.
The +10V T3 explains itself.
And T1 "common" can be thought of as a ground, even though it still has that 0V next to it (this is still dumb to me), made me think a little about it though.
Then I was looking at T2 & T4 for the last connection, well the notes column made that easy to figure out with the "0 to +10VDC" comment, it's an "input" to the VFD but your sending an "output" from the G540 (#8 VDF OUTPUT) and T4 falls into that voltage range.

See just a few extra words makes it all fall into place, even for a dumbass like me. LOL


For now, thank you to everyone, I'll keep this thread going as long as I'm working on this part of the adventure. Hopefully I'll get time over the next couple days to mess with this more.