A more logical test comes to mind if someone can confirm how the coolant sensor works on these...
Assuming its a (temperature triggered) variable resistor, then earthing out the wire to the coolant sensor should return the gauge to zero? Conversely, if you apply a voltage to that wire the gauge should rise? If we could get the correct test figures for full deflection, half deflection and zero deflection, then that should indicate whether the coolant sensor is faulty, or whether the fault lies elsewhere?
Thats where I'd be looking anyway, checking the integrity of the connection and doing this test - but only after finding out if the presumption is correct. If the sensor is
current based, then of course this is all bull££££
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