Rewiring for gauges, question.

[-sean-]

I'm in the middle of my rewire for changing over from idiot lights to gauges using the tips from GMC Pauls web site. I have couple of questions.

First off, why does the cluster power source have to come all the way from the junction box on the pass side front fender near the battery? Couldn't this just come from the fuse box?
Second, the wire that feeds the "battery" gauge is supposed to come from the red (+) wire that runs between the alternator and the regulator. Why cant the old wire for the charging idiot light be used for this?

Thanks guys