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Hi All,
I am in the process of a resto on an original Chevy badge  grill clod, and I want to retain the function of the power/economy switch while running a modern dual motor ESC, can anybody tell me how to wire it up and or give me a sketch please? 
many thanks,

You need a new esc with 4 motor wires and then follow the same building steps as in the manual.
Manual can be downloaded from this very site.