1. Create mission with a vehicle which supports dynamic loadout and has a cockpit display showing weapon status. (tried it on F/A181, To-201, To-199 and A-149)
2. start the mission.
3. enter the jet and go into 1st person view
4. view cockpit displays
N.B. On the A-143 it works, so it's probably not that the game can't handle it, it's just not implemented.