Replacing Instrument Cluster bulbs with LEDs - Illumination Detail Question - 67 Barracuda

Mike69cuda said
If you leave one regular bulb on the dash light circuit, the LEDs will dim reasonably well. It could be the bulb in your radio. I left incandescent bulbs in my aftermarket gauges.
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That...is brilliant!
Mike69cuda said
Try these, they work in mine.

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Do they need additional resistors or anything?