２０世纪工农业的蓬勃发展很大程度上应归功于内燃机。近几年来，由于使用了各种以引擎为动力的设备，美国的农民能高效地耕种更多的土地并能获得更高的产量。尽管内燃机设备的设计进步迅猛，但其仪表的发展却极其缓慢。在本世纪的大部分时期，内燃机仪表一直依赖于移动指针式 The boom of industry and agriculture in the 20th century owes much to the internal combustion engine. In recent years, US-based farmers have been able to farm more land efficiently and have higher yields thanks to the use of a variety of engine-powered equipment. Although engine design advances rapidly, the development of instrumentation has been extremely slow. For the most part of this century, internal combustion engine instrumentation has relied on moving hands