Do I really need the wire from the alternator to the bulkhead connector?

I ended up building my own headlight wiring kit. I would have loved to purchase it from crackedback but I guess that wasn't in the cards for me. I hope he is okay. I also ran a 6 gauge wire directly to the battery and 2 wire field alternator and an electronic VR and ignition. I also bypassed the bulkhead connector with the BAT. red wire. Fabbed up the Sunpro voltage into my rally dash. That is kind of cool. I want an idiot light too but aint figured that one out yet.

Can you tell me more about putting the Sunpro voltage meter into the rallye dash? I also have a rallye dash and will be pulling the bezel off soon, so this is a good time for me to do that kind of mod.