Chevrolet Chevette Automatic Transmission Indicator Bulb Size

Additional Notes

• The Chevrolet Chevette uses the 194 bulb for its automatic transmission indicator across all listed model years from 1976 to 1987, with the sole exception of 1986, which is not present in the specifications.
• The 194 is classified as a miniature wedge bulb, designated T10, meaning it uses a wedge-style base rather than a bayonet or screw fitting, and seats directly into a compatible socket without a separate base component.
• The 194 operates at 12 volts and draws 3.78 watts, placing it among the lower-wattage bulbs used in automotive instrument panel applications.
• The 194 conforms to ANSI standards and carries recognition in both the United States and Canada, indicating a standardized specification shared across North American automotive and aftermarket supply chains.
• Because the 194 bulb is an ANSI-standardized T10 wedge type, it is produced by multiple manufacturers and is widely available as a direct-fit replacement for the Chevette's transmission indicator socket.
• The T10 wedge designation refers to the bulb's tubular glass envelope width, which is measured in eighths of an inch, making the T10 approximately 10/8 of an inch, or roughly 1.25 inches, in envelope width.
• The consistent use of a single bulb specification across the full listed production span of the Chevette reflects a stable instrument panel socket design that was not revised between the 1976 and 1987 model years covered in the data.
• Substituting a bulb with a higher wattage rating than 3.78 watts into the transmission indicator socket carries a risk of generating excess heat within the instrument cluster housing, which can affect surrounding components.