FYI, 6v bulbs source

[BobR35]

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So I installed a set of mechanical gauges in my 35 and had to do a lot of research to get 6 volt LED no polarity bulbs and came up with a good source;
Superbrightleds.com.
The LEDs work beautiful on six volt positive ground and are small enough for the gauge size holes. They have a variety of bulbs and if you're hunting!