Fuel tank select ?

I'm trying to select the External tanks. However, only these key events are available: KEY_FUEL_SELECTOR_OFF KEY_FUEL_SELECTOR_ALL KEY_FUEL_SELECTOR_LEFT KEY_FUEL_SELECTOR_RIGHT KEY_FUEL_SELECTOR_LEFT_AUX KEY_FUEL_SELECTOR_RIGHT_AUX KEY_FUEL_SELECTOR_CENTER KEY_FUEL_SELECTOR_SETHow does one go about selecting the External tanks to feed? Is it possible to use the KEY_FUEL_SELECTOR_SET in some way? I see these token vars are available: FUEL_TANK_SELECTOR_EXTERNAL1 = 9,FUEL_TANK_SELECTOR_EXTERNAL2 = 10,FUEL_TANK_SELECTOR_EXTERNAL_ALL = 17,So my guess would be to use the KEY_FUEL_SELECTOR_SET with either one of these numbers (9,10,17)? Thanks for any help. Andrew