RE: Gyro in Airplane ??
I put a cheap gyro in the tail of my F4U Corsair. I love it. It has so much adverse yaw that I needed to use the rudder a lot in flight anyway, but the gyro really straightened out the takeoff and landings. My gyro just stays on all the time. I don't really notice it in the air. I am not new at this, and I think the gyro is cool.
I would be carefull with the p-38 though, my problem with having a automatic yaw control with a multi engine plane is that if you do have an engine failure you could be dangerously close to a Vmc rollover without realizing it. If you backed yourself into that corner I don't think you'd be able to get out of it.