Hello all!

This weekend, I was successful in reading RPM of the car off the ignition coil primary circuit.

This forum helped me a lot in achieving my goal.

My thanks to all of you, specially Michael Karas who took the pain in mailing the circuit diagram.

All I need now is a bit of software tuning and capacitor / resistor value calculation. Then it will be A OK !!

The zener diode did not make much of a difference if connected or not.

Regards
Aman