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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