Analog Speedometer instead Digital

[Sesjusz]

Hello,

I have Yaris II D4D 2006. My speedometer is digital.

My girlfriend have bought me on ebay analog speedometer from Yaris II 2011 petrol, it is a gift :)

In spite the new speedometer has max 8000 RPM (in diesel it is max 6000 RPM) it indicates correct actual RPM (I have checked it on computer), it also indicates correct speed, correct fuel gauge, average fuel used, actual fuel used. Everything seems to be right BUT one thing is not correct. New speedometer doesn't show me that my engine is cold. It shows me all the time high engine coolant temperature indicator. I have tested it on cold and hot engine.

It is possible to do any modifications (maybe in wires that are plugged to speedometer) to correct that temperature indications ?

My old speedoneter from YII D4D (2006): 83800-0D690-D
My new speedometer from YII petrol (2011): 83800-0DG10

My new speedometer 83800-0DG10 (engine is cold, sth about 6°C / 42°Fahrenheit):

I was driving one hour and on new speedometer was still indicating "hot engine", it newer showed me cold engine indicator.

Really sorry for my english language quality.
Best Wishes From Poland,
Sesjusz