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TR2/3/3A Fuel Gauge repair?

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The gauge won't work if the T and B electromagnets fall out of adjustment in their respective sliding tracks. If the coils are intact, then bringing the B and T (E and F) electromagnets into adjustment will probably fix it (assuming the needle moves freely).
 

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  • Fuel gauge calibration - e.pdf
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The electromagnets use wire the size of human hairs. If you are really good at very fiddly tasks, then you can easily repair the gage yourself. For most...it's probably best to send off to repair.
 
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