Temp Gauge

The ECU (& therefore Torque) uses a separate temperature sensor than that used for the gauge. The 2 sensors are both on the coolant outlet elbow behind the alternator - I can't remember which is which but disconnecting one of them temporarily will tell you.

The fault could be the gauge sensor, the wiring, or the gauge. On a 25 I would say the engine bay wiring is probably most likely - but the gauge sensor is easily & not too expensively changed so could readily be eliminated as a problem. The choice of how to proceed is yours..........

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Temp Gauge