It works. I pulled it out of my MJ when trying to diagnose a problem with mine dying from time to time.
Swapped it with the one from my donor. It didn't fix the issue and I was too lazy to put the original back in. It worked fine.
I don't know if it's plug and play, but I would think it is. Others on here will have to answer for sure.
87-90 I think are the same.
If you want it, PM me and we'll do the deal.