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 Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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