I'm assuming this is for a renix?
If I remember correctly, the 87-90 clusters were the same for XJ/MJ and Wagoneer. So, they were for 4, 6 and 8 cylinder. Point being, all the way one way is 4 cyl, all the way the other is 8 cyl. For the 4.0, it should be in the middle position.
Again, this is if I remember correctly.