'68 Barracuda -wire to fuel tank sender

No. Wire to fuel sender is a feed to the sending units variable resistor from the gage. If you run that wire directly to ground the gage will read full all the time.

The sender is grounded thru a clip that attaches to the metal fuel feed tube on the sender and jumpers over the rubber sending unit feed hose, and clips back to the metal chassis fuel line on the other side.

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