[tubman]

I had two things going on in this area. The first is a device that enables one to run any commercially available 12 volt negative ground tachometer in a 6 volt positive ground car. The first dozen or so sold quickly, but then demand just disappeared. It seems folks just didn't want to pay the price ($150).

For the second, we took a non-working Sun "Football" tachometer with a corroded control box, removed the internal workings, and replaced them with the circuitry required to run the Sun tach. This was also for 6 volts positive ground. It worked fine and I ran it in my '51 for a while. (I removed it to run a smaller tachometer head that was not so intrusive.) This also went nowhere, because it requires a non-working Sun setup and is quite labor intensive, as each job is a custom build.