you can tune the PC with them, but better to just get it dyno tuned and custom mapped.
Not completely true, the buttons do not affect the map file so the map is not ruined.NO do not touch any of the buttons! if you play with these esp after you just had a custom tune done.. you just threw money away and ruined your map!
these are a crude way to make adjustments to the map if you DONT use a pc or have a real map made