Nope, no oil pressure gauge, unfortunately. Don't know of the exact year it was done away with in the US, but I do know that the C class did not have one when it debuted in 94 in the US, so it was sometime around then.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record