Hi Caspar, I'm Pippz friend, remember me? Long time no see!
I'm checking on my references and I found out this picture of the starboard side of the cockpit, where you have a better image of the air pressure gauge, and I believe it's not a double, but a triple instrument. I'll look among my other reference material to see whether I have more about it, hope this helps in the meantime.
Cheers
SJ