I use the HiTec Aurora 9 with Telemetry (4 sets.) No problem watching while I fly. even have turned it on and paged to different pages while in the air.I bought a large Electric terminal and filed it till I had a tight press fit on the spark plug. Full scale planes use a special plug washer with a coax lead to the cylinder head tempon older engines like the 0-300 continual. newer engine monitors have special plugs that tape right into the cylinder head. Any way my set up runs from 190 to 220 till shut down then it climes for a bit. What's neat about the HiTec is the HSS NAVI I can plug into a USB on my computer and record every sensor for play back ...It can even be played back with the back round of Google Earth and U can watch it from any angle below, above, left or Right side. I often put a GPS Ari Speed set up in a Bomb and attach it to other peoples air planes that have th war birds with a bomb drop. and I can watch their sir speed, GPS altitude and GPS ground speed. I even record it with the NAVI and can play it back.What I want to do is video the plane and sink the video to a video of the computer screen showing the different read outs on the same screen by Picture in Picture. Someday when i get Round-To-It.