Pontiac Tempest front side marker bulbs use 194NA size while rear side marker bulbs use 1895 or 1893 size. The replacement chart covers 1968 through 1970 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac Tempest uses three distinct bulb types across its front and rear side marker positions: the 194NA, 1895, and 1893, all of which conform to ANSI standards for the US and Canadian markets.
All three bulb types share the miniature wedge base design, which allows tool-free installation by pressing the bulb directly into a friction-fit socket.
The 194NA is a T10 wedge bulb rated at 12V and 3.78W. It incorporates natural amber glass, meaning the amber color is produced by the glass itself rather than by the socket or lens.
The front side marker positions on the Pontiac Tempest for 1969-1970 both use the 194NA bulb, making the front fitment consistent across those two model years.
The 1895 and 1893 are both T5 wedge bulbs operating at 12V, but they differ in wattage. The 1895 draws 0.9W while the 1893 draws 2W, meaning the two are not interchangeable despite sharing the same base type and size designation prefix.
The rear side marker position changed bulb types between the 1968 and 1969 model years of the Pontiac Tempest, with the 1893 specified for 1968 and the 1895 specified for 1969.
The wattage difference between the 1893 (2W) and the 1895 (0.9W) represents a reduction of more than half the power draw, which affects the brightness output of the rear side marker between those two model years.
The T10 designation of the 194NA indicates a larger tube width than the T5 designation shared by the 1895 and 1893, making the front and rear bulbs physically incompatible with each other's sockets.
Because the 194NA achieves its amber output through colored glass rather than a clear envelope, substituting a standard clear 194 bulb in the same socket would alter the emitted light color at the front side marker position.