Here are some pictures that may interest you. I found some LED replacement bulbs on ebay from a supplier named allpartspipe. I want to reduce the heat of the bulb inside the gauge. With the incandescent, they get so warm that it causes condensation inside the glass, and my gauges would fog up (the small ones, not the tach and speedo).
Just to see the difference, I set up my gauges on the bench and used a bench power supply set at 13.2 volts. These photos are time exposures taken with the same camera, settings, and conditions. First the incandescents:
Then green LEDs in the next picture:
You can see that the incandescent bulbs are brighter than these LEDs, which are inexpensive ones. I am sure there are better ones available, so I am interested to see what others find.
What I notice is the difference between the gauges. The volt meter is the brightest, followed by water temp, oil pressure, fuel level, and amp meter is the most dim. My clock was out so not visible, but I see in David's pic that it is pretty bright.
My question is how to make them more even in brightness. If I have plenty of light, I can simply add a resistor to the brightest ones. But if the light is weak at best, I need to take the gauges apart and improve the light delivery inside.
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