Air core gauge

An air core gauge is a specific type of rotary actuator in an analog display gauge that allows an indicator to rotate a full 360 degrees. It is used in gauges and displays, most commonly automotive instrument clusters. A typical automotive application is shown at the right. The air core gauge is a type of `air-core motor`. It may be considered a.....
Found on http://en.wikipedia.org/wiki/Air_core_gauge
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