Everyone needs to really pay attention to the wiring with their swaps. Any monkey can drop in an engine, but if you don't get the wiring correct then you'll have no end of problems. This isn't your grandpa's carb'd V8..
Every week it's someone else with a swap and trashed wiring, or someone who let their friend who "knows what they're doing" play with electrons. This is arguably the most important part of a fuel injected swap, make sure to get it right..