Crap i cant take this any more i have 2 supra complete key sets this is for pre 89 so the one piece light thing wont work unless you take it apart or build it some how.
You have to drill your old lock cylinder out by that little round tab that only goes in when the ignition is in acc position. install my (driver/passenger/ignition cylinder/trunk lock cylinder) then your good to go.
If you are still locked out of your supra the easiest way to get in is goto the floorboard under the trunk release lever.
drill a tiny hole and push a nail through the floor board or just punch it through pushing the trunk release open crawl through the back hatch then unlock every thing.
but if your even faster then pushing a nail through the floorboard with a slim jim by all means or those master keys come in handy!
pm me if you want a complete set of matching key set (all the same) with all locks pre 89 and all matching!