As a matter of fact, the gauge pictured is for 1942, because it has a 21A part number. The first digit is the year. 11A was 41, 01A was 1940. It is a bit more
confusing before that, but in reverse sequence it went 91A, 81A, 78, 68, 48, 40 (twice), 18 and if you go any further than that, you are probably working on a Model A or a Model T.