We are cleaning a garage and listing as time allows. This is a  antique AC RPM gauge is a rare find for airplane enthusiasts looking to restore or decorate their vintage aircraft cockpit. Made in the United States by the brand AC, this original piece provides a touch of nostalgia and authenticity to Avionics aircraft. With no warranty available, this valuable accessory is perfect for collectors or those looking to add a unique and historical element to their aviation parts collection. I am no expert on this item. In the last picture there is some faded stamping on the housing but I can make it out. I have no way to test for function so this item is sold as is. A nice item for collectors. Buyer pays 12.99 shipping.