Oil pressure gauge on my 1965 230SL has a line from the filter direct to the oil gauge. The line is in two pieces. Out of the oil guage the line is steel that connects (with a fitting) to a rubber hose that directly to the filter. I expect many are the same. I am trying to determine the metric size of the male and female fittings on the steel line that go into the o/guage and line to the filter. The size of the steel line may also be helpful. Any suggestions
