If you are speaking of the welded plate and it has approximately these dimensions as shown in photos provided by Ross, it was probably done by someone wanting to access the sender. Why they would weld it up again after going to all that trouble is a question though. A screw on plate would make more sense for the next time it was needed. Does the yellow wire go to the sender or is it just laying there?
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51-6 trunk opening dimensions1.jpg (133.64 KB)
51-6 trunk opening dimensions2.jpg (134.61 KB)
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