My tank only has a driver and tank commander, does that mean the Targetting upgrades to my gunner doesn't do anything?

I am trying out the Pvlvv fm/42 and it has only a commander and a driver. Does that mean there isn’t any way for me to improve the targetting speed and accuracy?

Check the definition of that skill - if it requires/assesses the average of all crew then the skills in those missing crew do still count.