If you use the later model wiper delay that has the switch found on the turn signal stalk, you can just take the switch and the wiper motor from the doner car. You will have to wring the wires out cause the colors change from the non-dalay to the delay. You will also have to add a wire from the column mounter wiper switch, out through the firewall and to the delay wiper motor. Not a bad swap. I converted my 79 wagon to an 86 GP wiper delay. Just be aware you are going to have to remove the steering wheel, drop the column down from the dash, and get access to the back of the fuse box.