I am new to the AF5500 installed in a Searey. I have rebuilt this airplane and installed a new to it Rotax 914UL. I have about 2 hours on the plane now and the Tach has only incremented by about .75 hours. I have seen that it should log anything above 1250 RPM. My idle is at 1800 RPM so I would think it should be logging more tach time that it is. Is the tach recording a settable RPM? Also can I set the tach time for the replacement engine? The engine has about 104 hours on it.