Dewey, when you get that message, just scroll down and you can see the new post and all the old ones. That way you don't have to change screens and lose your message.
Since the trunk light switch bracket on the 84 and 85 is spot welded on, it might be easier to install a trunk release that has the light switch on it. I'm guessing this is for the Formula. All 86 and later had the trunk release and light switch integrated into one. Since the Formula was bare bones, you'd probably have to run a circuit from the front to the rear, however, I'd almost bet that the unused circuit is there. You'd just have to snake the wire through the deck lid, to hook it up. If it weren't for yours being a Formula, I have a notchie decklid with release, but it has a luggage rack on it.