View of a Ford 3-Ton M1918 tankette, used during World War I and powered by a pair of Model T gaslone engines:
Clik here to view.

Courtesy of the National Automotive History Collection, Detroit Public Library
Handwritten on back: “Ford 2-man tank, World War I. Credit: Col. Robert J. Icks Collection. Ford 3 ton light tank, c. 1918. 3.4 tons, max. speed 8 mph, two Ford Model T engines, one cal. 30 machine gun. Historical motor vehicles.”
Armed with just a single M1917 Marlin light machine gun (itself an updated M1895 Colt potato-digger), the Army wanted 15,000 of these to smother the Germans in 1919 on the Western Front but only 15 were built before the end of the war.
According to wiki: There are two known survivors; one is at the National Armor & Cavalry Museum at Fort Benning, Georgia; the second is with the Ordnance Collection at Fort Lee, Virginia.