According to Paul, he had it in the 2-wheel drive mode, but with the rollers still linked. And he has done another 2-wheel drive vehicle over the weekend without issue (again with the front and rear rollers belted together).

I've set up a second appointment with Paul at EIP Racing for wednesday and we will get the Mustang Dynamometer guys on the phone prior to doing the first run and let them run Paul through the settings to see if anything is amiss.

Also, I will probably pull fuses 17 + 18 ahead of time... should I pull the Anti-Lock Brake system fuses too?