Blue Wire In Plug January 13, 2019 NGK Blue Spark Plug Wires 7mm . Fits 69-83 all 6 Cylinder L Series Thick 7mm core blue wires. Made by NGK custom for the Z car. Fits 69-83 all 6 Cylinder L Series. www.californiadatsun.com Old Light Switch WiringHow Do You Wire A Double Light SwitchHow To Wire Cargo Trailer For PowerSwitches And Switching CircuitsPop Up Camper Wiring DiagramBoat Wiring ColorsHow To Wire A Light Fitting With 3 CablesBlu Ray Dvd Player With Surround Sound