HomeAll ProductsSpeedometer Insulator Gasket - 1947-1953 Chevy GMC Pickup TruckSpeedometer Insulator Gasket - 1947-1953 Chevy GMC Pickup Truck. Auto Metal Direct part number R-CT611. Available from M-A-D Rides, an authorized AMD dealer.Speedometer Insulator Gasket - 1947-1953 Chevy GMC Pickup TruckSKU: R-CT611$2.50PriceQuantity*Add to Cart