Tiny Halogen Light Bulbs for Snap On Alignment Rack Toe Gauges, The Size of a 194, but Not a 194

Demonracer said
Try looking into a 921 LED T10 wedge base bulb it is 119 lumen or 18 watts.

Thanks, but a 921 bulb has a 5/8" diameter and wouldn't fit in the hole on the gauge.

The halogen bulb I have has a diameter of .390", or just a touch over 3/8" (.375")

However you are on the right track and it gives me just another clue in the bulb mystery.

Thanks,
Tom