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This is the LED tachometer I made. Calibrated as follows (Every 3 LEDs = 1000 RPM) I've printed a photo paper for the dashboard Instructables here
DIY LED Tachometerby abo_hosni
Measure RPM - Optical Tachometer by electro18
DIY Digital RPM Tachometer | RPM Counter With Arduinoby CircuitMagic
DIY LED Tachomter (RPM gauge)by abo_hosni
Digital speedometer, tachometer & engine temperature displayby abo_hosni
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