Hello I Have a Dodge allison 73 motor home speedometer does not work i checked all cables down to transmission with drill and dash gage worked.The problem I believe is in the teflon speedometer transmission gear? But the gear looks ok should I be able to feel the metal internal transmission gear to line up with my teflon speedometer gear ??? or don't the two gears mesh until transmission is put in gear??? Then line up and mesh together to ingage speedometer ????