Designed For Multi Engine:IMPORTANT: The G4 is designed to handle the special requirements of twin engine aircraft. It is not as simple putting in an instrument for each engine. For example logging data from each engine simultaneously in a single file is crucial because comparison of both is key. Comparison in flight is important too so the G4 can display both engines at once or one at a time for a more detailed view. Of course it is easy to display whatever you want. The G4 also does exhaust valve analysis, fuel flow totalization and horse power calculation for both engines simultaneously. Just like our single engine instruments it provides the very important probe analysis for easy troubleshooting. Nothing comes close to the power, ease or simplicity of the G4 for twins.Leaning: G Series is best technology available, there’s nothing else like it, nothing even comes close.Operation lean of peak requires special information that only the G3 or G4 Graphic Engine Monitor can provide.The G Series instruments are extraordinarily capable yet easy to use.