This is an exceptionally nice NOS accessory gas gauge. Made by the "Rochester Manufacturing Co. Rochester N.Y. USA" The threaded portion of the cap that screws into the tank is smaller in diameter than a Model T cap but I'm sure it could be modified to fit. The depth of it looks right for a T tank. $100 plus shipping.
The gas gauge is no 2
Larry o think I'm going to pass to much work to make it work on my T