I hope someone comes along to do a better job than I in explaining this, but I always thought of a gas gauge as an ohmmeter measuring ohms to ground. If you hook it up and it pegs, then you either have to much or too little resistance to ground, depending on how it is wired. Pull the float and check resistance from the ground and the post. Swing the float and make sure the resistance changes. You may find that you have a bad wire between the sender and the gauge or that you need to bend the float arm to get it to read on the gauge.
You can test the gauge by putting power (and ground)to it. It will read full or empty. Then ground the sending unit terminal. It should swing all the way the other direction.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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