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Daniel,
I got mine already set-up for 220V from Jaycar. It's just a Neon indicator lamp, and remove the bulb from the green/ red housing.
Looking at it, the resistor just seems to be soldered to one of the bulb legs in parallel; (this, based on whatever the resistance of the bulb is, assuming 100K, would drop the voltage to around the required 80V)
Hope this helps.
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