I'm hoping you mean Lockup Convertor since the 200-4R does not electrically shift to OD. Assuming lockup convertor, I use an automatic (adjustable) speed switch which has its own mounting pod. If I was just using the more common ON/OFF switch method, I would consider using a factory switch for an option you don't have. Example, on a 2nd gen Firebird I may use a rear blower or Defog switch or something similar mounted in the stock location.
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"Objects in mirror are closer than they appear" 
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