1912 Cadillac Speedo drive

Hi Everyone I am trying to find out some information for a friend of mine - who is a week or two away from driving his 1912 Cadillac, after a 35 year restoration! The info relates to the speedo. He has the larger speedo gear (affixed to wheel - 35 teeth), but not the gear that is attached to the speedo drive. He wants to know how many teeth are on it, the outside diameter etc, so he can make one up that will accurately measure the speed. Does anyone have a spare one, or is anyone able to tell us the specs of the gear!?!? Thank you in advance for any assistance you may offer Best Regards Trent

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1912 Cadillac
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