Gauges go to full tilt!?!

I used a 7805 digital voltage regulator from DigiKey. In the picture I mounted the 7805 onto a heatsink to keep it cool (on the right). The regular gets 12v in, 5v out, and has a ground. I didn't have any black wire, lol.

Allpar has some good info on it. Richard E. did the write up.

Vintage Chrysler electrical repairs and updates (part 2)