I sorta did the reverse on mine I have a 89 and put a 87 control stalk on it then ended up using a 87 steering wheel. I then switched back to the 89 stalk as the 87 broke a lever. So I had to pin out the connections on both stalks and transfer the 3 prong cruise hub to the 4 prong stalk. The cruise can work provided you keep the dash on off switch
It sounds confusing and you can pm me if you have any more questions. should respond within a day or two. hope this helped.
Take the stalk out of the car,
Unscrew the horn hub from the stalk assembly,
Open the wiring harness covers ( at the bottom of the stalk and bthe coiled one by the connectors),
Seperate the wires and take the horn hub with 4 wires and look at where they mount in the connector,
The 3 wire horn hub matches the colouring and location minus one wire (yellowish pink iirc that does on/off)
pin out the wires and slide the others in.
Reassemble and your done.
The 89+ have better ends and feel like much higher quality than the earlier style. I intend on getting a 4 prong hub and the right steering wheel as I did this as a temp fix for a safety inspection. I'm not 100% positive that your cruise will work but I see no reason why it would'nt withthe dash switch.