My brother has a 67 GTX that has the speedo needle stuck, odometer miles work fine but speedo MPH doesn't. Have a couple of questions, will the 120 mph speedo mechanism and needle work if you just change out faceplates. Second question, I can see where the mechanism is held on to faceplate with 4 small black headed rivots but how does needle remove without damagimg needle, I know on a Coronet the needle doesn't have to be removed from mechanism in order to change faceplate because needle stem doesn't go thru faceplate. Anybody have any experience in this would be greatly appreciated. Thanks