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I did that LED gauge mod with blue LEDs behind my instrument cluster. But Whenever I try to dim my LEDs it wont dim or it wont get brighter. Does anyone else have this problem? Does anyone know what I should do about it. I know my dimmer switch worked before I put those LEDs in. Thank you.
 

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That's not entirely true Sal. The brightness of LED's can be controlled by Pulse Width Modulation. IIRC, you are right in that the stock gauge illumination setup in a car (our car at least) can not perform Pulse Width Modulation (PWM). If you really wanted to make them dim you could possibly make or purchase a PWM unit to allow the LEDs to dim. Here's a good page that helps to explain PWM (http://www.iguanalabs.com/pwm.htm)
 

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I was thinking about doing that mod. Are the lights too bright or too dims. If they are too bright I could live with that.
 
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