Dick, the little gyro I have is a real cheapie. I bought it from Fast Lap Hobbies when they went under for something like $12. I'm not sure what the street price was.The gain is set by a screwdrive. It will swing the rudder stop to stop if you set the gain up, Not knowing where to set it, I just chose the mid point. I've got an older Futaba mechanical gyro system, two pieces also.

A lot of the newere one will let you set the gain from the TX. Seems that might be desirable.

One other thing that I'm looking at for dead engine on a twin is the Twin Sync. Less than a good gyro, and I've read good things about it. It slows the fast engine to the speed of the slow one, but gives you the ability to gain full control of the running engine by going to idle and back to throttle up. My concern with it would be a dead stick on approach, One then the other engine going to stop and then idle might just be the end of your plane at low speed and altitude. The gyro may give enought help that you could save it. Got to think that over some.

Don