Digital Coolant Temp Gauge not working

I’ve never noticed the temp gauge jump from 50 Deg to 90 Deg, not gradually.
Under hard acceleration or going up and down hills this can happen if there is an issue, such as coolant too low or thermostat stuck open
 
Does anyone know the torque setting for the thermostat housing bolts.

This pic is showing the temp gauge when the heater is blowing out warm air and the engine has taken me to the local shops 1/4 mile. The gauge isn’t showing any temp.
048D95D6-85D2-4BE7-815E-6C9AAC94691D.jpeg
 
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The system could have an airlock in it, but that's unlikely if the coolant level has been maintained on max. For the sake of £10 or so I'd just change the thermostat. I wouldn't worry too much about torque settings just tighten them up gradually and sequentially.
 
Did you ever get this resolved. I have similar issue on my 2016 1.4 Petrol Zafira
Hi I have the same problem .I have changed thermostat. I have changed the temperature sensor and I still don't have the temperature gauge working on my vauxhall zafira tourer 2018 1.4 any help thankyou
 

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