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Did you turn the bulb around?
Do go with LED. I have done my complete gauge cluster in deep purple LED and everything works perfectly. The thing about LED is that it is one way install. If it does't work the first time you put it on, then take out and turn it 180 degrees and reinstall. Highly recommended painting the rear housing and back of front gauge cover bright silver to help reflect the light everywhere. I will post a picture later of my gauge cluster.