I had a similar issue on my 200tdi- see third pic for possible cause....
https://www.landyzone.co.uk/land-rover/2-5n-a-to-200tdi-conversion.168563/post-1733336
Here is a little poem "wot I rote".
There is no cause for alarm. I had a brief black dog moment the other day that had me sink rather low for a brief time; and it made me reflect on how we are conditioned to respond to such moods and I thought...