250 ox66 tach reading "0"

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Mar 28, 2015
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Please help!!!! 3 weeks and 2 Yamaha factory tech and still not fixed. Winky blinky says cdi. I have twins and switched cdi and other still says same thing. "0" . Switch back to the other engine and it works fine.The other functions on the tach r working correctly. I have switched voltage reg, cdi, checked continuity from front to back , bought new tach. At my wits end. Not sure what else to look for. Any help would b appreciated.
 
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