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Nope, it won't work with OBD-II if you want to connect to the Data Link Connector (Diagnostic Port) directly.
What you have to do, As Jirka has shown in in schematic, is to intercept the signals from the Speed input, as well as RPM from the coils, and Fuelinjector duty cycles, effectively bypassing the car's ECU.
If you want to connect to your car's DLC directly, you will need an interface, eg ISo/PWM/CAM/KWP that is compatible with the language (read protocol) that your car's network is using.
@ Jirka: Good attempt, will work well for your application. 100ms is a good update rate, and should provide jerk-free movement of your "pointers"
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