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Paul, the optoisolator used with the shunt would also work well to isolate your voltage measurement. A 1000:1 divider with a 68 ohm output resistance would give a 200 volt full scale. You might have to put a C across the 68K part of the divider, just like tuning a scope probe. There is a spare isolator in the package with the third version of the shunt. This one uses brass closet bolts instead of salvaged starter solenoid bolts, so more can be made.
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