1979 Johns 85 hp OMC Tach Setting?

Jake Swift

Cadet
Joined
May 23, 2012
Messages
11
Hi,

From what I have read on the other posts that the tach should be set to 6. Can anyone verify this? I have checked all power (purple and blue) and ground (black) to the tach and appears to be good. Haven't checked the grey wire yet. I assume this is the pulse from the engine. I still think the tach is out based slippage calculations. I have 3% slip with my OMC prop and -4% with the SS prop both in 17" pitch.
 
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