Denny,
 
I installed a new DG and Artificial Horizon when I redid my panel.  Used AeroCrafters Super Venturi and have had no problems.  I have an electric turn and bank, but the Venturi will operate all three gyros.  The cost difference between the electric Vs vacuum gyros just didn't make sense to me.  As for added drag, well the difference between 100MPH and 100.05MPH didn't matter to me.  If it is important, there is a STC for placing the Venturi behind the nosebowl for those extra "Mph's"
 
Hank
N47HG
Austin, TX

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