Have you determined why the sending unit does not work. When I took mine out of my 31, the arm and gears were frozen up and the cork was near powder. I cleaned everything up and got things moving and purchased a new cork from the FS. I did have to remove the rivets and removed the cover. With the cover removed you can clean it up and make sure there is good contact with the arm contact (I believe there is a small spring there) and the coil. Make sure there are no breaks in the wire on the coil. An ammeter can help here to test for continuity and resistance. Have some fun and try to fix it if you can.
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