Chevrolet Astro Automatic Transmission Indicator Bulb Size

The Chevrolet Astro automatic transmission indicator utilizes bulb sizes 194 and PC194 to provide illumination for the gear selector display located within the vehicle dashboard assembly. Data provided for the specific lighting components covers the production range from 1985 through 1995.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1994-1995	PC194
1993	PC194 (With Digital Inst. Cluster)
1985-1992	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10) with printed circuit board twist-lock socket, for instrument clusters. 12V, 3.78W.	PC194
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194

Other Locations

Additional Notes

The 194 bulb is specified for the Chevrolet Astro automatic transmission indicator across the 1985-1992 model years, making it the more widely used of the two bulb types in this application.
The 194 is an ANSI-standard miniature wedge bulb with a T10 form factor, rated at 12V and 3.78W, intended for instrument cluster lighting duties.
The PC194 shares the same ANSI-standard T10 wedge form factor, voltage, and wattage as the 194, but incorporates a printed circuit board twist-lock socket designed specifically for instrument clusters with that mounting configuration.
The PC194 is specified for the 1994-1995 model years, and also for the 1993 model year when equipped with the Digital Instrument Cluster.
The 1993 Chevrolet Astro is the only year in these specifications where the bulb selection depends on the instrument cluster type, with the PC194 applying exclusively to the Digital Instrument Cluster variant.
Although the 194 and PC194 share identical electrical ratings, the twist-lock socket of the PC194 makes it non-interchangeable as a direct drop-in replacement for the standard 194 in sockets not designed for printed circuit board mounting.