Hey all, just wondering... are there any tachs out there that you can read while flying? Basically, a sensor in the plane and a gauge/ LCD readout on your transmitter? I have no *need* for this, but I think it'd be kinda cool to be able to see what RPM your engine is turning in flight during different maneuvers and throttle settings, and get real time readings.

*edit- I always hit the post button too soon... If there is nothing like this out there, would something like this be feasable, from the frequency stand point? I assume it would need it's own channel, seperate from the transmitter and reciever, so would this be against any AMA rules?