ok, trying to do a wierd retro fit deal. want to install the dash mounted wiper switch with delay. this was used on early 80s rigs. a member here is parting an 87 blazer and has the modual for it. now the 87s had the wipers on the turn sig. lever. is there any difference in the modual? option #2. i found on a search that Year One sells a modual that plugs into the back of the dash mounted switch and the factory harness plugs into that. anyone have anything to lend to this?