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Old 10-20-2019, 07:25 PM   #10
High Wire
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City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 2,826
You are going to need to start with a table:

Actual RPM from a photo tach or some other +/- 1 RPM measurement;
Lower Tach;
FB Tach

Find out which one is closest to true then adjust the other one.
After adjustment you will need to redo the table to see how you did.
It can be very frustrating!
Good news is you can do it at the dock.
1984 Monk 36 Hull #46
Currently southbound in Florida ICW.
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