UFO-LOW,
I had exactly the problem you mention, when I tried LED bulbs with a 270 degree beam pattern. Some gauges were brighter than others and some were bright on one side only. When using bulbs with a 360 degree beam pattern, I think you'll find this problem goes away (just like with incandescent bulbs). Your voltmeter is the exception, as it must have different internal construction, that lets more light through to the front of the gauge.
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