If it's really an 83 300D with an original manual tranny then it's a Euro model without a turbo. Typically an older MB with a manual tranny does not have a tachometer. The only one that I know has it is the US spec 190D.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL