It should help keep it in a straight line but that kind of takes the fun out of it. What do you mean on the ground? If the body is parachuting you have an aero issue. If it's lifting the front off the line you need to practice throttle input and maybe adjust a slipper or something.
Dragster should have a locked diff. Gyros senses lateral morement, Set EPA to minimum. Gyro My personal feeling waste of $$ for Dragging, maybe something if drifting. Dragging like 10th scale on road, set up.