Car nuts in general view mechanical gauges as superior, possibly an obsolete belief, and also a mechanical gauge of some sort is what a Model A owner would have had if he had installed some sort of aftermarket gauge in 1930; it can be or be disguised as a period accessory. 1930's ones were either Bourdon like modern or sometimes just a long tube thermometer, what Ford used as accessory in 1932 and as OEM later in 1930's.