My previous thanks is to rodmcm.

Thanks for sharing the code Mr Rodmcm

Hello everyone.
I am working on a prototype device. It reads the speed of a gasoline engine from the ignition coil signal.
Dear TinkerBearNZ, I have no words to thank. You can't imagine how much it helped me. Thank you very much.
The world needs people like you. Selfless help.
Strong hug.