I agree with all the above, don't take any chances its not worth it.
But at the same time i don't trust land rover temp gauges, there rubbish, it would be well worth your time to do what Dan says and fit a non Land Rover gauge and sender its not difficult and the parts are pretty cheep!
I thought my 90 was over heating, i'd already had a new rad so i knew that was ok, changed the gauge and sender now no problems the stupid LR gauge was way way off!!