I've installed 3 Hot Wire harnesses. One 360 Magnum EFI, and (2) 5.7 Hemis. Their harnesses flat out work. They are a plug and play, you only need to connect 4 wires to you vehicle and you have functioning EFI. Should there be a problem, their tech line is outstanding, they walked me through a screw up I did on the 1st one.
I'd install their harnesses in everything if I wasn't so cheap. Gene