What is this plug / cover for? Does it need to be there?

Good info, thanks. I had a good laugh the first time I saw mine. My Jeep really is held together by tape.

There's a good running joke in the full size Wagoneer world. When AMC introduced the electronic/vacuum/servo cruise control in the 70s, they took the control module and just duct taped it beneath the dash board.

Actual duct tape.

So after 20-30 years the modules fall out onto the floor, and people freak out thinking some intricate mounting bracket broke. "Nope — you're missing the factory AMC duct tape."
 
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