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There's no way anyone can post hundreds of pages of wiring diagrams for every iteration of the 02 Ford Ranger. See this post on how to get the diagram you need
https://ricksfreeautorepairadvice.com/get-car-wiring-diagram/
You need to check the dash voltage regulator. You might have lost ground at the sending unit. It might be a break in the wire going to the dash. It could be a bad sending unit. The fuel gage could be defective. Anyone of these can cause the fuel gauge to not work. The hard part is finding it. The most common would probably be a bad sending unit. I would check that first. You just will have to check them with a voltage meter. Find which one it is and change it. If you need anything else, let me know. I am here to help. Thanks for choosing FixYa.
When testing a fuel guage you should disconnect the wires to it,guage should read over full,ground the float wire,turn off key then turn back on should read empty.You have to cycle the key for guage to move.If still inop the wire is broken in the harness between the tank and the dash.Voltage on the float wire is low.When tested with a test light it will barely light the light and pulsate.This test indicates the wiring is good.
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