Toyota Tercel Instrument Panel Bulb Size

Additional Notes

• The Toyota Tercel instrument panel uses the 194 bulb across the 1981-1986 and 1991-1998 model years, making it the dominant fitment in the specifications.
• The 194 is an ANSI-standard miniature wedge bulb rated at 12V and 3.78W, housed in a T10 wedge base, which is among the most widely used instrument panel bulb formats in North American vehicles.
• The 1980 Toyota Tercel instrument panel takes the 74 bulb, which differs from all other listed model years in both bulb type and wattage.
• The 74 is an ANSI-standard miniature wedge bulb rated at 12V and 1.4W in a T5 wedge base, drawing significantly less power than the 194.
• The T5 and T10 designations refer to the bulb's tubular envelope width, measured in units of one-eighth of an inch, meaning the T5 is 5/8 inch wide and the T10 is 10/8 inch wide. These two sizes are not interchangeable.
• Because the 1980 model year uses a physically smaller T5 base rather than the T10 base found in all other listed years, substituting a 194 bulb into a 1980 Tercel instrument panel socket is not a compatible fitment.
• Both the 194 and 74 bulbs conform to ANSI standards applicable in the United States and Canada, indicating consistent regulatory classification across the two bulb types used in these specifications.
• The wattage difference between the 74 (1.4W) and the 194 (3.78W) reflects the smaller filament and envelope of the T5 format relative to the T10, a distinction relevant to socket and circuit compatibility.