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Dimand @bmwfreq64 Can'tbe done easily mate. Just finished pulling one of these things apart completely. It uses a microprocessor with an ADC input to read the voltage. It outputs a number based on a voltage up to 2V. Scale is 20.5/1V. It has a voltage divider to generate the correct calibration. You can remove the voltage divider and substitute your own to measure something with another scale but it needs at least half a volt to read up to a 10