I've read that the dimer switch doesn't work when you switch your dash over to LED's becasue they take to little power. Is there a way of putting in a resistor or something so that your able to make the dimmer switch functional?
pulse width modulator, basically it varies the amplitude that the current is coming on so it is able to crete a dimming effect with leds. But if you only have leds in your cluster I don't think it's worth while to do, If you have everything in leds then you can consider doing it.
Basically if you have an 1999-02 truck all you need to do is just reroute the illumination wires going to your headlight dimmer to a pmw circuit and use a rehostat to control the dimming of lights. I believe the 03+ trucks utilize this from the factory or another variation of it.
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