My hunter pro c has one COM wire and 9 zones, do I need another COM wire when installing Rachio 2nd ? Since one COM wire and 8 zones go left side, one zone on right side, do I need additional COM wire on right side ?
No, you are all good. All common terminals on your Gen 2 controller are interconnected. Good question 
Welcome to the community,
Gene
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That was super quick response, awesome, appreciate the support.