engine wiring help

wow!! that makes things ALLOT easier to understand. so its cool to run all that power for the stereo through the sta relay? as far as the connectors, the guy i have making it says he has all new plugs and terminals so thats not an issue. to be honest i wanted to run the stock gauges if i could, but have been putting off the wiring. also as mentioned in the previous post im putting the battery in the trunk and was debating doing the start em up relay so the + from the battery isnt powered all the time considering its going through the interior. what do think about this will all the stuff i got going on?