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Glyn,
Does the wire to your fuel sender run near your woofer(s)?
The fuel sender is a variable resistor. If the big magnets in the woofer(s) are inducing a current in the sender lead it might make the gauge twitch.
Temporarily powering the radio from a separate power source (another battery) might help narrow the search.
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Jim
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A Gnat! Quick, get a sledgehammer!
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