The K values are marked on the transducers themselves. If you have bought them from JPI, they may also be in the packaging. The manual tells you how to input the numbers. I am using the standard settings which from memory are 29000, but I would have to search papework to confirm.
I got FF with my JPI 760 and it is great.
When installing the transducers, make sure you have the minimum 6 inch straight hose runs to the transducers otherwise you will get irregular readings. Mine took extra long hoses with loops to provide the straight runs.
Regards - Dave
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