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 - Product Review: JB Weld - by Staff. JB Weld is basically an epoxy glue that does an exceptionally good job of bonding to cast iron and steel along with several other materials. As I mentioned, it is so common that I have yet to buy a tractor that did not have JB Weld used somewhere. It is sometimes used so well you can't tell its there and other times used as a sloppy quick fix. Finding where and how it can be used correctly is key to whether you are using it as an "inelegant hack" or an integral solution to difficult and expens
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