Backup Switch Wiring

The reverse lamp switch for automatic, on the column or extended to the floor shifter moved to the transmission during 68 model production. Since the switch always was on the manual trans, the move made the in car harnesses more similar ( reverse lamp wiring routed through bulkhead for all ). earlier were different inside and out. Anyway... This may explain the aftermarkets' inability to list what is exactly correct for a 68 build. Reads like you have it fingered out.