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This part is used behind various door and window handles from 1958-1966:
1958-1959 door and window handles
1960 door handles
1961-1963 front window handles
1964-1966 front and vent window handles
Features an improves design, they are more reliable and accurate in different environments (heat, humidity, etc.) They feature solid state electronic circuitry and variable control. They are pre-set to factory specs, but adjustable to fine tune your gauges.