Installed this instrument into my RV-9. All four cylinders were connected to the instrument with bayonet probes. It installed in minutes in a, now, unused locaction. I connected the wiring and the probes, turned it on and it fired right up indicating the current OAT. Used the manual to set it up for my desired displays and it was very easy. Im considering getting another for my EGTs.

Installed fine, but does not operate as expected. Useful if you only want to see 4 temperatures total from your engine - even with the RDAC. The manual states clearly up front Up to 12 Thermocouples can be measured using the external RDAC. Yes, there is only 4 channels displayed at a time. However there is no way to cycle between those other channels simply with the rotary knob - say 4 EGT and 4 CHT sensors. To choose which 4 channels are displayed on the screen you navigate into a settings menu with several clicks. Further, you can only choose one set of bar graph labels and corresponding alarm temperatures - vs setting labels and and temp limits for each group of four channels. Why the manual advertises accepting up to 12 thermocouples with the RDAC is lost on me. Im contacting MGL in case Im mis-understanding this units function. If I am, I will update this review. I think its great hardware and MGL has a great lineup, just very confused on why the software doesnt let you rotary knob between groups of 4 with corresponding labels and temp limits. The point of adding an engine monitor vs cheap single cylinder analog gauage is to see all CHT and EGTs.