The 1966 - 1967 GTO Package Series installed, features a 3 3/8" Speedometer, Tachometer.Features include:All-electricIncludes mounting brackets, hardware, and wiring harnessGreen LED turn signal indicators, Blue high beam indicator, in-dash housing (single turn signal for 64-65. Double turn single for 66-67)Push-button speedometer calibrationBuilt-in ECM signal filter switchClassic Instruments' Zeus Speedometer Technology is built-in meaning the cluster requires no external control boxes and works directly with ECM or VSS signalsLS sending unit kit included, fuel gauge is calibrated to 0-90 ohmInstalls with original bezel, diffuser, and lens* Bezel, diffuser, and lens not included. Use your original bezel, diffuser, and lens