Mike, if you have the original head unit on your 89-90 model, these do not have a factory CD Changer input.
I dare say someone out there might know a way to modify something to take one, but it won’t be straight forward?
Or do you already have an aftermarket head unit?
Post 90 models have the Alpine head unit that accepts the changer.
Sorry to be the bearer of bad news.
If someone fitted a changer into your car, they were clearly hopeful at finding a way to rig it up, but fruitless attempt?

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