cast iron Prestolite/Pertronix ignitor conversion

Yes, it will interface with PC or Android device with USB capable of serial communications. Some devices only implement the port for charging.
I use free TeraTerm as terminal emulator

Use will be simple. It will default to 8 cyl, it wil capture 8 consecutive ignition event times, sum the times measure RPM, display that, display deviations in degrees. It will repeat, updates every 1/2 second, faster than that changing numbers may blur.