I have an '00 audi v8 engine I pulled from an A8 I bought for a project, I am wanting to know what all is needed/not needed to make it run(electrically), as if I am just running it before putting it in another car. Instrument cluster, TCM etc. I am also having a hard time figuring out how the fuel system works as I want to hook it up to a fuel cell not the original tank. It looks complicated, I see 4 different lines from the stock one?