You can download Acoustic Tachometer (RPM) APK 1.0.0 (01357), Per minute revolution of engines are calculated by Acoustic Tachometer RPM which checks the calculation frequency so that the sound produced by the engine can be analyzed. Better working and performance of the engine is imperative to analyze on a regular basis. The app may not work on all the engines since it does not recognize too noisy or muted engines.
It still shows some values even if there is no sound or any motor function. You can use this app at high revs and normal engine sounds. Upload 4Share APK to Google Play
What’s New Acoustic Tachometer (RPM) 1.0.0 APK:
App Name= Acoustic Tachometer (RPM)
Package Name= com.javiery.rpmgauge
Developer= Javier Yáñez
Age Range: Everyone
Requires Android= 2.1 and up