I'm acctually glad I ran accross this topic. I also have an 05 Single cab, short bed, 4.3, 2wd but with an auto tranny. I've been looking for a new hobby build and I've been doing a bunch of homework on swapping in a 12valve T Cummins. I was going to purchase a motor/tranny probably in the next week and begin rebuilding everything before install. I was wondering how the factory gauges were going to work with the new sensors, I see you managed to get through it pretty easy, do these same tricks apply to the 12v? I'm also planning on doing an SAS with 1 tons early next year.