Arduino Tachometer

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  • Instructable, with display - Sensor $1, display $5, arduino nano $4, headers $1 - $11 in parts + 3DP enclosure with direct wire, no PCB, freefloating electronics with pin covers + spacers + mounts - great for productization. (Where is link?)
  • This is even cheaper than a $19 tachometer - [1]