Classic/Antique Car Repair: 25 Chev mechanical gas gauge cap, hemmings motor news, needle in the haystack

Question
Do you have a recommendation for where I might look for a gas gauge fuel tank cap, such as Marvel used to make, for my 1925 Chev?

Answer
As always when asked a question "where can I find..." the answer is always the same. Start reading Hemmings Motor News, the worlds largest classified ad book for the old car hobby. Then if you are close to Hershey Pa. there is the biggest swap meet in the USA there this weekend. Good luck finding the "Needle" in the haystack that is.