Hi...I also have a Farmalll 340 that was converted to 12 volts with negative ground. I have not been able to get the gas gauge to work. The 340 tractor was originally 6 volts with positive ground. The positive ground issue seems to be a problem for the gauge. My gauge works fine when I test it off the tractor with a separate 6 volt positive ground circuit. But it won"t work with negative ground regardless of how I switch the wires around. The gauge itself seems to be built just for positive ground polarity. The other thing you need to be aware of is that the sending unit is actually a 6 volt variable resistor and if you give it 12 volts it will burn out. Not a good thing to burn up a resistor inside a gas tank. So, you definitely want to add a resistor to supply just 6 volts, but the polarity issue would still need to be solved somehow. Pete
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