I am helping a friend install a speedometer in her 1994 E320 to replace her defective one. She bought exact same part number speedometer and had the mileage reset to match her actual mileage. Is there a need to calibrate this speedometer with her current tachometer or just install and go? Any ideas how to calibrate both if needed?

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Joe95E420

Just install it. it has already had the calibration that can be done.

Calibration is done on all but digital speedos by inputing a given frequency (revolutions on cable driven ones) and verifying that 60mph results (for mph speedos). The frequency or numbers of turns is written on the back of the speedo as K= or W=.

If this doesn't result in proper speed due to changes in tire size or gear changes then custom calibration is needed or a converter installed.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Thanks Steve. I was under the impression that you needed to calibrate anytime you replace either tachometer or speedometer. This one is not digital and doesn't have speedo cable either. just a couple of wires plug in the back of it.

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Joe95E420

It is electronic just converts it into an analog dial.

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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)