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The speedometer is driven off the tailshaft in the transmission. It doesn't matter if you have automatic or manual, there is no slippage as far as the speedometer and driveshaft is concerned. What does matter is the final drive ratio. If the final drive is the same for auto/manual cars, then you can swap speedo heads with no issue. If the final drive is different, you will have incorrectly reported speed and odometer mileage.
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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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