Compatible with 1964-1966 Chevrolet/GMC C/K Series Truck & Suburban

This harness plugs into the dash harness at the firewall on your truck. Common circuits include the ignition coil, wipers, heater blower, starter, temperature, oil pressure and others, depending on the year and option of your truck. Fits trucks with V8 engine, HEI ignition upgrade, and factory gauges (not warning lights).