Most Fuel level gauges use a resistor in the sending unit to send current to the meter. the meter then converts this to needle movement. (usually using a bimetal heat sensitive bar with a heater wire wrapped around it, or by an electro magnet movement sensitive to current. In most applications, the gauge gets power through a IVR (instrument Voltage Regulator) or directly from the ignition terminal on the key switch. From the gauge the current flows to the tank sending unit, and from the variable resistor in that to ground. It may not make a difference which post is connected! I hope this helps some. Jim
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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