After a recent avionics install, my tach time is incorrect and fluctuates while operating.
For example, on today's flight, I started with 564.4 Dynon Hobbs Time, and 487.8 Dynon Tach Time.
Midflight, the Dynon Hobbs was 566.4 (2 hrs) and the tach time fluctuated between 489.1 and 490.3 (1.3...