Not a fan of pulsin or count... I could do some calc... but i feel lazy... did you measure the frequency range of your signal?
What's the min, and max? From what i remember 1,000 RPM for a 4Cyl signal is ~30 HZ.. but noisy 30Hz, so you must do some signal shaping and some average (samples) of it, unless it's not going to be really accurate...




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