1987Comanche, i'm in Summerville,about a 20 min. ride up I-26 from Charleston. I did not have to replace the stalk as this delay works independently. Simply plugged in between harness from my stalk switch to harness under dash. The instructions say that it works with "standard wiper wash system only" (base truck) it is a on/off control knob,and delay module combo that mounts under dash. when you rotate the knob to the right to turn it on it starts the wipers at a fast delay ,and the more you rotate it the slower the delay. The wipers stroke fully ,and park at a rate i control! Oh and the stalk switch still works as it did before off,low,high. Will get some pics later today. :cheers: