It may have been removed (sometimes is) - depending on the king pin set-up.
Mine does not have anyway of activating the one shot oiler, but I understand some have a foot operated "pump" near the cluch pedal....
Look at your front suspension. Is there a "brake" pipe like pip going to the top of the king pin? If so this will go back to a manifold on the bulkhead (if like mine).
The manifold wil be feed by an oil line from the engine block.