Swapped my 1995 4l60e Tahoe over to a manual Nv3500 transmission. Absolutely cannot get the speedometer to register. Replaced speed sensor on tcase exc. is there something else that needs tied in? Truck has factory wireing, added harness for neutral safety and reverse lights. Tach and all other gauges work. NV3500, Np241c tcase. All out of 1995 doner truck.