I just had to comment. Many people don't know or understand what is meant by a voltage divider. Its nice to see someone who does. Once had a legend in his own mind computer genius sit for three or more hours trying to rig up a joystick which is nothing more than one or two voltage dividers. Digital vs. analog. lol
There is a simple one amp three terminal by pass regulator LM7806 or equivalent type that will provide the necessary 6 volt output for your gauge. The only additional parts needed will be a couple of ceramic or mylar caps and possibly a silicon diode. I don't think your gauge draws nearly one amp, but you might need a heat sink as these do give out a little heat depending on load and higher amp versions and modifications are available. Radio Shack has them but they can be bought cheaper. Its just more convenient to buy them locally rather than buying them 10 or more at a time on line.
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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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