Signal from car ignition coil

[jim-p]

See this:

Reading pulses through Inductive Clamp

raschemmel: Ignition pulses are electrical. RPM is mechanical. apples and oranges There is one ignition pulse every 2 RPM, it is not as if ignition pulses are completely random. All I have to do is count the pulses. These same clamps are used in dozens of different types of automotive equipment to read RPM. They're using on dynos for an RPM signal, timing lights to detect spark and flash a bulb, etc. Companies even sell them to use with their logging software as an RPM pickup: https://ww…