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97 E-420 (180K miles), 97 SL500, (93K miles) 2015 GMC Sierra Denali 2500HD CC/SB/4x4 Duramax(55K)
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part may be due to the oil you are using. the M119 is an older engine and the recomended oil for normal temperatures is 15W-40 or 15W50, they don't recomend the lighter weight oils till temps are below 0F consistently.
 

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It's no wonder MB switched from a pressure gauge to oil temperature right at the time they went from mineral to synthetic specifications.
I think it was more likely just general cost cutting. Remember the switch to synthetic oil didn't come with the introduction of the 112 and 113 motors (1998/99 MYs) but later (circa 2001) in conjunction with the O'keefe oil sludging class action. The requirement was then back-dated to the start of FSS in the 1998 model year. I believe it came even later in Europe.
 

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1996 SL500, 2000 E430
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Your gauge readings appear to be consistent with the grade of oil you are running. :)

Where is the CEL on your model? Can't see it in the photo.

On mine ('91 500SL) it's just above the speedo pointer.

Regards
Rob
It's at the far right along the bottom row of all the lights
 

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'86 300 SDL '93 500SL '91 BMW M5 '91 BMW 735iL
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Thanks to this thread I was able to diagnose a similar issue with my '93 500SL. Zero oil pressure at idle after driving, but rising to 3 as the engine speed increased. Changed the oil pressure sending unit (easy job) and oil pressure is now 1.3 to 1.4 bar at idle.
 
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