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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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