Does anybody know if the mechanical tach gear box ratios differ from
A/C engine to A/C engine? I would expect them to be all the same
but I am not sure.

Paul Lamar

The Lyc runs off of the backside of the cam at 1:1, so 1/2 of crank speed.
I think the Continentals are the same but haven't looked a one in a long
time with this in mind.

Bill Freeman

 
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