I recently replaced the distributor cap on my 1986. If you take off the distributor cap, you will see that each wire plug is labeled with the cylinder number it supplies. But to save you the aggravation of pulling the cap, here is the order on the cap starting on the driver’s side of the car: 2 – 1 – 3 – 4
Now, if the cap used on a 1989 is different than one used on a 1986, then all bets are off.
The cylinders on the engine are numbered sequentially with the one closest to the front of the car as #1 and the one closest the firewall as #4.
I hope this helps.