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Why won't the needle on my tach go to zero? |
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- All Sunpro tachs feature an air-core meter movement.
- Air-core movements "float" until power is applied.
- Each time you turn off your ignition switch, the tachometer needle will come to rest at some point on the scale.
- This type of movement responds faster and is more reliable than older D'Arsonval movements.
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