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A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.
The tach timer integrates over time the instantaneous rotation speed displayed by the tachometer. The displayed number is incremented by one if the engine is run at its reference speed for one hour. The displayed number is incremented by one if the engine is run at its reference speed for one hour.
The Sunpro Alwin (サンプロ・アルウィン) is a multi-use stadium in Matsumoto, Japan. It is currently used mostly for football matches and is the home ground of Matsumoto Yamaga FC . The stadium has a capacity of 20,396 spectators.