Ok. Lets see if I have this right.
R3 will be another Isense resistor, for the "display unit"
U1 will be used to amplify the voltage from the Isense resistor, outout to ADC.
R1/2 acts as the voltage divider from the output, driving U2 acting as a buffer to the ADC.
bit confused about 1.3V referance that is fed into U1/2
Thanks
Did you see the latest schematic in my edit.??
Its uses R7 to make the circuit simpler.
The -1.3V is already available in the original circuit.
The buffer is needed on the divider as the adc expects an input impedance of less than 10K
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