Frankfurt am Main
Our workshop is located in Frankfurt Rödelheim and is easily reachable via the A5 and A66 motorways.
Calibration FrankfurtSpeedometer Calibration for Mercedes
Professional odometer calibration of all memory locations. Specialist workshop in Frankfurt am Main – on site or nationwide by post.
Manufacturer Service
Professional Speedometer Calibration for all Mercedes Models
Tacho Frankfurt is your specialist for speedometer calibration of all Mercedes-Benz models and classes. From the A-Class to the S-Class, from the Vito to the Sprinter – we have the latest diagnostic tools and the necessary experience for a precise, complete speedometer calibration of your Mercedes.
Particularly for newer Mercedes models, synchronizing the Electronic Ignition Switch (EZS) and the Assyst service logs is mandatory to guarantee full system compatibility and a clean history.
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Vehicle Coverage
Supported Mercedes-Benz Classes & Models
We calibrate and adjust almost all Mercedes classes, vans, and commercial vehicles:
Mercedes Passenger Cars
- A-Class (W168 / W169 / W176 / W177)
- C-Class (W202 / W203 / W204 / W205 / W206)
- E-Class (W210 / W211 / W212 / W213 / W214)
- S-Class (W140 / W220 / W221 / W222 / W223)
- CLA / CLS / CLK (all series)
- SLK / SLC / SL (all series)
Mercedes SUV & Vans
- G-Class (W463 / W463A)
- GLA / GLB / GLC / GLE / GLS
- Vito / V-Class (W638 / W639 / W447)
- Sprinter (901 / 903 / 906 / 907 / 910)
- Vaneo / Citan (all types)
Memory Locations & Systems
- Instrument Cluster (KI speedometer module)
- EIS / EZS (Electronic Ignition Switch)
- Assyst / Assyst Plus (Service interval records)
- Engine Control Unit (ECU / CDI)
- CGW (Central Gateway module)
Everything You Need to Know about Speedometer Calibration for Mercedes
Mercedes-Benz is one of the vehicle manufacturers with the highest requirements for security and data integrity in vehicle electronics. The Assyst system (automatic service interval system) and the integration of the mileage into multiple control units make speedometer calibration at Mercedes a demanding task that requires true expertise.
Particularly for newer Mercedes models from W203/W211 onwards, the complete synchronization of all memory locations is absolutely necessary: instrument cluster, ignition switch/EIS (Electronic Ignition Switch), Assyst (service display), engine control unit, and gateway must all be consistent.
For some models, we offer speedometer calibration including ignition switch and Assyst reset – a service that many other providers do not perform completely.
Common reasons for a Mercedes speedometer calibration:
- Broken or replaced instrument cluster (e.g. after accident or defect).
- Import from Great Britain: Converting miles to kilometers.
- Vehicle electronics repair: ECU or cluster replacement.
- Restoration of a classic or modern classic car.
Note on Assyst Service Logs
Mercedes vehicles store the exact mileage at which the last services were performed inside the Assyst module. If the dashboard is adjusted but the service logs are left with older, contradictory mileage entries, any Mercedes workshop tester will instantly flag a manipulation. At Tacho Frankfurt, we update the Assyst logs to ensure complete integrity.
Our Service Area
Speedometer Calibration on Site or by Post
Visit us in Frankfurt Rödelheim or use our nationwide postal service.
Wiesbaden & Mainz
From the state capitals Wiesbaden and Mainz, you can reach us comfortably in about 30 minutes.
Learn MorePostal Service
Send us your Mercedes instrument cluster securely packaged. Calibration and return shipping are usually completed within 24 hours.
Shipping ProcessEZS / EIS (Electronic Ignition Switch) Calibration for Mercedes
In Mercedes-Benz vehicles, the Electronic Ignition Switch (EZS/EIS) acts as the master gateway. It securely locks the vehicle keys and duplicates the odometer reading. If a dashboard is replaced or adjusted without modifying the EZS, the EZS will automatically overwrite the dashboard value back to the higher reading as soon as the key is turned.
Tacho Frankfurt utilizes advanced EEPROM and microprocessor programmer clips to recalibrate the EZS safely. This provides you with a clean, fully integrated odometer adjustment that leaves no trace in the OBD history logs.