" Gearbox Fault "

Hi All,
I have a 97 P38 4.0 Auto and I've recently been getting an intermittant fault message on my display. Say's " Gear box fault ".
Description as to what happens is as follows...

Normally lose P , R or D on the display when selected gears are used. Lose the Sport button, and when I pull away in first gear it's like trying to pull away in second gear in a manual car.. no power. If I'm stationary and put it into drive, gears do not automatically engage causing the constant rolling you get with any auto. Also I get an ABS fault and RH window not set. While I'm driving and hit the brake, rev counter and speedo act funny.
I've tried using google to find out what it could be the cause, and a few bit's have pointed to connectors under the expansion tank, or replace the battery. This i've looked into and even replaced the battery.
All to no avail.. and it's and intermitant fault so sometimes it has worked fine.
Additional to this now I have also lost Left hand indicators, and complete failure of dash display and speedo and rev counter, again it's not a constant fault..

Any one got similar faults.?

You need to post this in the RangeRover section. You'll probably get more replies. & if you can delete this post as well it'll stop the section from getting cluttered up.