How do I change gears in the NAMCO home version of the old school arcade game Pole Position?

We have a NAMCO home version of the arcade game Pole Position, but no instructions. The other games work just like their arcade counterparts, but when I play Pole Position I can't seem to shift gears and therefore can't pass my computer opponent. Is there a solution, or was this game marketed without the ability to change gears?

Game


I remember having an older version of one of these years ago. Took me forever to figure it out, but you must rotate or twist the joystick to change gears. Clockwise shifts up, and counter-clockwise to shift down.