Would you guys say this is the most correct way of doing it? (Diagram on top of page)

http://www.madelectrical.com/electricaltech/amp-gauges2.shtml

1973 Dodge Charger SE 400 automatic transmission. Curb weight: 3800 lbs. All stock so far. Goal: Reliable everday driveable warmed up 400 as close to 400hp as possible, then a 470 stroker if need be. Don't protect a feminist when the collapse comes!