One of the speedometer light bulbs has gone, hence the LCD mileage panel could not be seen.
Taking the shroud off by removing one screw reveals two more screws that secure the speedometer. With all screws removed, turning the speedometer unit clockwise a bit can get it out easily.
Unplugging the 2 cables can set it free.
Replace the burnt bulb and it is back.
However, I immediately found the brightness is different between the speedometer and odometer
Following the same procedure, I changed the bulbs of the odometer too. By doing so, I found that the bulb near the top end of the REV mark has already gone indeed. I thought it had gone before I bought the car. Unlike the LCD panel on the speedometer, without the pre and the post comparison, I thought the relative darkness was normal and I was not aware of the burnt out bulb.
Wow, much nice to look at the REV red line now.
Removing stains on the instrument cluster cover
When I was fixing the speedometer and Rev back light, I tried to remove the stain found on the cover surface too.
I used the polish liquid for mobile phone screen. After testing it with stain at the edge, it seemed working.
And the result is: clean and clear
Content I had read before I replace the speedometer light
https://www.alfaowner.com/threads/156-speedo-backlight-blub-blown.32266/
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