transmission shaft of revolution counter
engine revolution counter [= revolution counter]
intermediate counter-shaft
propeller shaft revolution indicator
shaft revolution detector
shaft revolution indicator
crime of counter-revolution
eddy current revolution counter
engine revolution counter
hand revolution counter
revolution counter
旋转计数器
转速计
回转计数器
回转计速器
回转数计
转数表
转数计
转数计数器
计圈计数器
revolution counter hand