I know OEM tractor parts carries guages. I don't know how good they are.
On the 12v conversion... You'll need a 12v generator/alternator, a 12v starter and a ballast resistor for the coil.
Some folk say that a 6v starter will work on 12v for quite a while. There is risk there. I wouldn't go that route, but...
All the ballast resistor does for the coil is cut the voltage to 6v for the coil. Running a coil on straight 12v will burn it out FAST. You can get a 12v coil, but they're pricy.
I've seen a bunch of folk running GM alternators in place of generators. That's what I've got on my M. I've converted it to 1-wire operation with a special voltage regulator. I'm still not happy with it, but I've got other things going on right now.
Your ammeter won't know the difference between 12v and 6v.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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