Abstract: A dual indicating tachometer apparatus for utilization with ground vehicles such as automobiles and trucks for differentiating between the rotational speeds of the engine and clutch shaft of the vehicle. Two sensing devices are utilized with one monitoring the engine rotation speed of the vehicle while the other monitors the rotational speed of the clutch shaft. Either mechanical dial or digital electronic display means are utilized to expose to the user of such a vehicle the difference between the rotating speeds of the two vehicle elements in order to advise the user of the operating characteristics of the vehicle itself and to facilitate for the user the shifting of the vehicle's transmission. Means are also provided for displaying the respective rotating speeds of the measured elements as well as for indicating the difference in rotational speeds therebetween.