Install volt meter in place of ammeter wiring question

I want to replace my ammeter with a sunpro volt meter for a factory look (well almost). I was going to solder the old ammeter wires together and try to upgrade my under the hood charging system wires. What is the best way to send power to my instrument cluster when I unhook the ammeter? Is tehre any other things i need to upgrade or chane with this modification? I looked at the MAD electrical page to add in the under the hood modifications. I also plan on making the denso upgrade as well to the alternator.