I ran a speedo check following someone whom passed through 3 different speed limits. I would have to say that the Speedo that I installed is correct speedo (123 542 27 57) for operation with the 2.88 gears. I will verify this test sometime over the weekend.

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1980 300TD-T (82 Turbo and Trans) 159,000 Miles "Jackie-O"
1983 300SD 272,000 Miles "Aristotle"
1987 Jeep Wagoneer Limited - keeps the MB's off the ice and out of the snow
1994 BMW 530it