Great question Jim.
Anymore, I forgo the gag. As 99% of my play is done while spreadeagle on my back, It is too risky. I used to do it and struggle through the difficulty of swallowing my saliva but ended up, I believe, getting pneumonia from it. I breathed in some saliva during a play session and was in the hospital the next week. I enjoy playing with gags and would if I had someone else to play with, but, during my self-bondage play, the electricity usually gives me enough to think about and deal with.
Dana