It's wrong. I can assure you there is no way to enable a a non existent temperature gauge. I owned a 2.7D XF for one year and my present 3.0D S for six months. Why would Jaguar disable such a useful facility?
There is no indication of coolant temperature which can be very useful. An "Engine Overheating" message is no better than a warning light as it only appears after something has gone seriously wrong. :o