King-Seely did the temp, gas, and oil gauges, but I don't think they did speedometers.The 38-39 book put out by the Early Ford V-8 Club shows Stewart Warner, Waltham and Delco for the speedos. 37 used the same suppliers. The 35-36 book and the 33-34 book do not indicate speedometer suppliers, but in 1932 they used the same suppliers as 1938-39. I suspect that Ford used these suppliers througout the V-8 era