The sullivan OBG that I have plugs into the throttle channel. The throttle servo plugs directly to the back of that plug piggy back style. There is another plug that goes to its own battery. I use a 2000mah 6v battery pack, same as the rx battery.

There is a ground wire that attaches to the engine block as well.

You can adjust when it actually powers up the glow plug, mine is below 1/4 throttle ish [link=http://www.sullivanproducts.com/ModelProductsMainFrame.htm]Sullivan OBGD[/link]