That price is for an entire plug and play harness for the engine and transmission, and I may be wrong....but I think it includes reflashing your computer. The dude I bought my Hemi from has built several street rods with 5.7 Hemis, and he says you plug in all the connectors on the harness, hook up a hot wire and a ground, and then literally turn the key and VAROOM! Even though $900 sounds like a lot for a wad of wires, it will be worth it to me. The more aggravation I have when building a car, the less I like it when it's done. I forgot....you really need to buy a fully baffled gas tank too, and that's a chunk of change also !