The fuel sender is the same as gas cars. it has two wires. You need to ground the positive wire to a known good ground. If the fuel gauge moves all the way to full then the sender or the ground wire to the sender is bad. Next just bridge the two wires together. I f the gauge moves to only half way with the wires touching then your ground has some excessive resistance. If you can't make the gauge go to full then the gauge is most likely the problem. You also might unplug the cluster and plug it back in to see if you can make a better connection.
Hope this helps
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83 D24T 245 .50mm oversized pistons, 3 inch exhaust, but otherwise stock except the boost is turned up to 20 psi. 81 VW Caddy 1.6TD with some minor head work, and big exhaust.
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