Update for anyone interested:
So I worked out with some testing with a new temp sender (PRC2505) and taking the gauge out to test separately that there was an earthing issue with the gauge. Connected up on my bench to a power supply and the...
Sold the Range Rover and bought my very first Land Rover Series II - 88 - 1960
Absolutely love it but lots of work needed and always appreciate any advice or input to help me bring her back to concourse condition.
https://www.johnrichardssurplus.co.uk/land-rover-intermediate-gear-219468.html
This is the part number from series 2 and 2a parts book and valid to suffix A
What gearbox and suffix is in your landy
https://www.sp-4x4.com/533080_p/533080.htm