410 water temperature gauge

[livermoreb]

The Water Temperature Gauge on my 410 does not work. I can't find anything about it in the handbook or the workshop manual so am stumped.

The fact that it does not show on the wiring diagram leads me to think that it is not electrical and there is a coiled uninsulated wire coming from behind the dash to a plug on the inlet manifold just behind the thermostat housing that I assume is the sensor mechanism. Can anyone confirm this?

Is there a way of testing whether it is the actual gauge or the temperature sensor that is broken or is it possible to get the whole assembly? I have seen water temperature sensors for sale on ebay but these all appear to be electronic types. Also it is possible to but a complete gauge and sensor but these would not look right.

Any advice or experience would be gratefully received.