Denso Alternator Installation

See thats the problem, The guys who have all these electrical upgrades, but old stock wiring like me. I have HIDS, MSD, Gauges and Im adding Electric fans. I want to get a better Alt. maybe even the denso since its smaller and lighter than the stock higher amp one, but I have to worry about the stock wiring dont I ? I have relays in the Hids and will in the Fans.
Here is a good read for you using the factory wiring harness...

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