Dummy Light to Gauge dash swap chaos! Help?

[67stepchic]

So I have a 67 c10 that has butchered wiring like you wouldn't believe. After some bad info on dash lights I fried the printed circuit from the original dummy light cluster. So, am replacing it with a gauge cluster out of a 70-72 model c10.

I've read GMC Paul's write-up, and a few million other Q&A's...

My problem is wiring of the alternator and battery to the respective #1 and #12 slots on the loom plug...

1. I have no junction block
2. This truck was in some way converted to an internally regulated alternator when the PO also did an HEI conversion

So where do I get these wires from so that my gauges read properly? Any help would be great!