ok, quick idea to spread out the light, i'd try it with test led's first though, so you dont waste a 3 led condom if it doesnt work.
take a piece of glass, put a huge glob of hot glue down, stick the led's in it where the light emits, let it cool, pull it off of the glass, cut the hot glue into a circle so that it fits into the gauge cluster, maybe even take some sandpaper to the hot glue, rough it up a bit, should spread out the light at least a little... and it shouldnt take but 3 mins to do this.... so it's pretty much win/win.... on paper anyway.
lemme know if you try this.
oh, and a quick note, if you use 4 leds in series, you dont need any resistors.
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