I know about the linking bonuses in the exosuit/multi-tool, and I'm wondering if the same mechanic applies to your ship. I put two similar components next to each other, but I don't see any UI indication that linking is in effect.
Update: It turns out that the items need to be in good repair for the mechanic to take effect.
Best Answer
Yes they do work the same way as the multi-tool upgrades.
If you have connected Pulse Jet upgrades they are highlighted as a dark blue which is sort of hard to see. That might be what you are experiencing.
Here is a picture for reference