cheapest way to get hemi 3g going?

I bought my board pre-assembled from diyautotune.com

They asked a few specs from my build, and built it for me. I also bought their harnesses with 10 foot length or whatever. And I have a junkyard harness off a hemi (~$100?). I'll splice it all together, use tunerstudio to set everything up per the directions from diyautotune, and I expect it to work. The only 'difficult' part of the process should be the wiring and choosing the right settings in tunerstudio.