Thanks for the help guys. I wired it just like the last diagram and it worked perfectly. 2 gallons of gas lasted about as long as the battery and I got about 25 minutes of 2,000 rpm break in.

As for hooking a transmission up to the stand, I built mine 100% modular so I can make any adjustments. Everything slides and moves, but once locked in place it's rock solid. I used receiver hitch steel (about $10 a foot) and drilled / welded nuts in place. I will post some more photos.

Again, thank you for all the help with the wiring.