6 volt to 12 volt conversion question

I converted a 1955 Ford F100 from 6v pos. to 12v negative when I installed a 392 Chrysler FirePower Hemi from a New Yorker several years back. I didn't have to change any wiring because the 6 volt system ran a heavier gauge wire the the 12v. Just changed the light bulbs to 12v., took the voltage regulator from the Chrysler and ran a voltage drop to the gauges. Never a problem with the electrical system ever. A very easy conversion. This was back in 1972.