Td5 disco cluster fault no revs speed or fuel and max temp

hi everyone im in desperate need of some help I’m struggling to fix my disco, so one day the clocks died no speedo revs or fuel gauge and temp went to max this happened for about a week then in the floods I went ploughing through some deep water and everything sprang back into life (surely related) then three or four days later while driving everything died again same symptoms as before.
So with no key all dials are in the down position, key on the temp gauge goes to max fuel gauge stays at empty and revs and speedo unresponsive all other lights come on and off as expected.
Had the clocks out checked the pins and plugs they are ok also checked voltage on pins 18&19 on the plug which is ok,
I’ve checked all of the fuses they’re all fine pulled the fuse box out that’s all clean underneath and bone dry
The earth point under the carpets is clean,
I removed the temp gauge sensor to see if that was what was the culprit, no change
I’ve removed the ecu and inspected the plugs and pins no signs of corrosion or moisture so put that back on that’s fine,

I am literally at a loss where to go next somebody please help

The Land Rover experience continues

Have you plugged in a Hawkeye or Nanocom?
Maybe your BCU is on the fritz but often these sorts of things are fuseboard related. Dont take my word for if tho.
Post in the Discovery section and Sierraferry may be able to help