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Unrelated, I would he curious how fast the live data is actually outputted and if could be of any use.
Some Ford OBD-I systems (EEC-IV, but not all variants) use the Data Communication Link (DCL).
DCL supports both standard UART and CART (Custom Asynchronous Receiver/Transmitter) modes.
Maximum data rate is 19,200 baud, depending on the ECU.
There are approximately 40 different parameters that can be read, including RPM, ECT, MAP, FUELPW, etc.