It looks like you have it right.
For reference...
http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Primary_Voltage_Selection_Jumpers_at_the_Transformer
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Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info