Machine7 specialise in Parts, Spares and Accessories for Air-cooled VW Bug, Beetle, Bus, Camper, Karmann Ghia and Type-3.
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If your Fuel Gauge needle moves around all over the place while you are driving, the Stabiliser is most likely the cause of the problem. As the fuel sloshes around in the tank, the sender will be constantly moving. The stabiliser evens out the signals, to give a more constant reading.
If you are getting no reading at all, and unsure whether your Fuel Sender or Gauge is at fault .. try disconnecting the wire at the Fuel Sender end. Connect this wire to a good earth, if the Gauge goes all the way to 'full', your sender is at fault. If the Gauge shows no reading, the Gauge or wiring is most probably at fault