Bulb fuel indicator
I have tried to find my sheet on the bulbs that were used in the T series cars, but at the moment I can not locate it. I know that the TC Motoring Guild put out a sheet, and I had another one also, but can not locate either. I know it is a miniature screw and I think it is a G-31/2 bulb type, if this is correct, suggest use a #53 or 53X which is 14.4 volts at .12 amps (120 mA) the
53 has an average life(on) 500 hours, the #53X is rated at 5,000 hours (lots of empty fuel tank time), both are listed for auto.
This is about one half of the current suggest in the ignition lamp. The coil mentioned is in series with the lamp, if it goes, the lamp will not light.
I realize that when the lamp is first lit, that the current is higher, however if it is doubled, which is for just for a few milliseconds, the arc, still is not anywhere near hot enough to cause a problem. With a resistor in series the current is still higher, maybe not as high, but higher at turn/on, and it must be keep in mind, that you want the same brightness (watts) so, if you decrease the voltage across the bulb, by increasing the voltage across the resistor, you have to increase the current to get the wattage, thus almost the same arc at the points.
The only reason I mention a capacitor, you sometimes see a capacitor across the points to cut down on radio static, and/or to save the contacts.
Will look more for the correct original bulb number..
Cheers Dean