Some LED's are polarity sensitive. Not all are dimmable. The cheaper ones you can get through amazon etc typically won't have the ability to dimm and are likely polarity sensitive.
If you purchase LED's that are polarity sensitive, having the cluster out to where you can see the printed circuit and it's ground paths is almost essential. If you're trying to do this with the cluster in the car, buy the higher dollar LED's that don't care.
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-Jason
1969 Pontiac Firebird
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