There is a 12 volt electric motor with a vacuum pump that is relativily  
inexpensive (200.00 or so) that can power all your gyros.  I will try to  get 
info 
on it but believe that Glenda McAlwee knows where to get them.   They are 
automotive but easily adapted for a reliable vacuum source.    Shell be here 
tomorrow and I'll ask her and let you know.    Bill

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