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Bi-metallic strip gauges Sensor Terre Heater coil Needle 12v powersupply Bi-metallicstrip Linkage Calibratedscale

Bi-metallic strip gauges creep up to their readings gradually when you switch on the ignition.

The sensor unit allows a current, varying with the engine temperature, through to a heater coil inside the gauge.

A bi-metallic strip inside the coil bends by an amount depending on the size of the current and deflects the needle across a calibrated scale to give a temperature reading.

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