I agree- the sender is likely. And to remove it requires some trickiness. Slip a taped up screwdriver under your drivers side rear quarter window frame. Amazing as it may seem, the windows are only held in by the friction of the rubber gaskets to the body. The whole frame ass'y will slip right out! Then remove the engine screen and the gas tank cover. The sender is held in with a series of machine screws. It has 3 wires attached: a ground, a sender power and a warning light power. Don't get them mixed up- make a drawing with wire comors. Don't depend on the factory wiring diagrams- they are sometimes ALMOST right....A thorough cleaning and inspection may show (or cure) whats wrong. If you are of an inquiring nature and the thing is dead, try a sender from a '71-73 Alfa Romeo Spyder. You'll need to transfer the resistence unit itself and other stuff from the Alfa unit to your OEM, and you'll lose the red warning light function in your dash, but it can be made functional (I'm told- haven't done this)
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