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Since software update? Which one??? Didnt know one existed??
To reset the trip computer, try this.
Press and hold the button on the end of the wiper switch, then turn on the ignition. The trip computer should now enter self test mode, you should see the screen with all charactors present and it will cycle one by one. Youll see what I mean!
Press the button on the wiper switch again to see the contents of the fuel tank in litres. Press again to see road speed in metres/sec - should read zero! You are parked!
Press again to see the fault codes. You may see DJHC or similar, or just some dashes _ _ _ _ or _D__H. Doesnt matter which.
Press the trip recorder button in the speedo binacle to reset the computer. You will need to drive at least 0.3 miles to reactivate all the functions.
Hope that explains it and hope it works now. Let me know if it was successful.
Now I have had time to read your post while not on the phone! I may offer the following comments.
We are talking your EXTERNAL temperature gauge?
If it reads -40 then it has an open circuit (broken wire or poor connection)
If it reads +140 then it has a short circuit to + or earth. If it just reads erractically, then its probably just a faulty sensor. Its located in the N/S door mirror, the little black bump protruding from the underside of the mirror.
The ECU update is in no way responsible for this error in operation.
Take it back to your dealer and tell them exactly what symtoms the gauge is showing as that will help them a great deal.