If you want really great gauge lighting you should go with EL wire. It illuminates the gauges very evenly and brightly and the dimmer works on it.
Only drawback is the high pitched whine.
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I had no idea mine might be making any noise, but my high-frequency hearing is pretty shot!
But I love the steady, even, non-glaring illumination of my gauges. I haven't noticed any heat or excessive power consumption, but I have a high-output alternator on mine.

