I just got my airplane back after a complete panel upgrade. I added the Dynon engine monitoring suite to better integrate the system. I have a Grumman AA5B and noticed several items when 9i got it home. my main concern is my CHT's. The system indicates high 200's to very low 300's. Normal Grumman cylinder temps are in the upper 300's for the back cylinders. my question....shouldn't an avionics shop check that the data is correct? If I were to lean the engine using these CHT's and they are significantly wrong, I could quickly cause severe damage. What is normal for a shop?