Speedo & tach reading incorrectly

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Speedo & tach reading incorrectly

02-09-2014, 12:37 AM

Winston Wolfe Winston Wolfe is offline

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Join Date: Nov 2013

Location: 19464

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Speedo & tach reading incorrectly

I'm working with a:
1981 300CD Chassis
1982 240D Manual Gearbox
1983 300TD Turbo Engine

The speedo and tach read -1mph for every 10 (so 65mph indicated is really 59)--I've verified this via GPS. And the tach reads accordingly too, so that indicated 65mph is turning at right about an indicated 2500rpm. According to several speed/rpm calculators, those numbers jive together.

I'm seeing conflicting information about where the tach & speedo get their pickup; can anyone tell me how to correct this? If there is a way to correct this?

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