You should be able to find the fuel tank harness under the car near the fuel tank. If you look just in front of the rear axle on the drivers side you will see two connectors Unplug the connector with the grey, purple, black, and black/white wires.
Ground the purple wire. Turn the key to the run position. The gauge should read full. If it does you have a bad sending unit (the part in the tank that tells the gauge what the fuel level is at).
If the gauge still reads empty you have a bad gauge.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
When I unplug the one with the purple wire, the gauge automatically goes to full without me, grounding out the purple wire what does they mean?
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My 98 gas gauge works but it says that full is e I think it's working backwords? Idk
The sending unit in the fuel tank is probably faulty. Rarely is the gauge the issue. Your friendly local mechanic can take care of it for you, unless you want to try it yourself. Which means dropping the fuel tank to get access the the fuel pump/sending unit assembly in the tank. Very tedious. Hope this helped! please let me know if you need anymore help.
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