Bike LED Tachometer

  
Its based on inductive pickup and very easy to install. Have a look at the pic. (remove LED and connect transistor collector to pin4). I hope it will exactly suits to your tachometer.
Bike LED Tachometer - schematic

I found your PIC project collection very nice. I have been working on tachometer for my motorcycle. In your article you said that you don't know how to connect the signal wire to automotive.



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