1964-1966 Dash Cluster Wire Harness (For Trucks with Factory Gauges)- GM Truck This harness connects to the back of your instrument cluster at each gauge and has all the light bulb connections. all of tuckers wire harnesses are made with the original blueprints, original connectors, and original color wire. this helps to assemle your truck’s wire harness per the factorywire diagram. the best thing about our hanresses are, they are made in u.s.a.!