My thinking is this, that perhaps your standard instrument cluster for certain models (in this case the fiesta one looks very similar to ours) comes complete with all required indicators and readouts, maybe internals only, fitting a range of models.
The fact that the temperaturegaugeis not used in the B Max may not mean that it isn't present.
Thinking about it, perhaps with the simplified warning light only setup, the sensor in the engine coolant is only a simple switch, rather than a full sensor, which gives a varying output depending ontemperature, so perhaps the b Max is cheapskated to the simple option.
On the other hand, and most likely, the sensor is a digital device, which reports to the ECU, which in turn illuminates the over-temperature device when overheating occurs.
My service manager at my dealer owes me a favour, I will pick his brains in due course.
I may well consider purchasing a Canbus or OBD11 interface if I decide to keep the car. I had one with my VW Golf, and saved a few friends a lot of money putting out erroneous warning lights.
John.
Edited by: john51