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 - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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