Turning on before chanking the reading on my EMS D120 jumps up and down and pegs alot. Where do I need to look. Also erratic after chank up. Can I disable the map reading till I can get it fixed? I have a rotax 912-ULS. Is it going to hurt anything (short out burn, fire, etc). THis started after an annual. Maybe they pinched a wire or something?? I think I have 4.2 firmware on my 2008 CTLS