Mod Details

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Cloning The Roadster Speedo

Cloning is a process where you take data from 1 item and copy it to another to make an exact replica.

Why Would I Need To Do That?

If your speedo has failed completely, has a hardware or PCB fault, you need to fit a new speedo.

Can I Just Fit A 2nd Hand Speedo?

You can but it might come with issues.

The odometer won’t show the correct distance travelled. If the new speedo has a lower mileage, the car will display ——. If the speedo is a higher mileage, it will write the new higher mileage to the SAM unit. That means your car will show a higher mileage than it has actually done. To fix that, you have to adjust the mileage code in the speedo and the SAM unit at the same time.

Not showing the correct mileage on the speedo  can cause problems during the annual car test of your country.
The service reminder may not ever appear either (thanks Gaz).

The donor speedo may also not have paddle shift activated so the paddles and horn won’t work if your car had paddles originally.

The donor speedo also contains the incorrect VIN code for your car. This will flag up during diagnostics on MB Star.

If you fit a Brabus speedo to a standard car, it won’t show the correct speed.

Official Way

If you went to smart, they’d want you buy a new speedo and then charge you 1 hour labour. You are almost certainly looking in excess of £350. Fuck that. Why not just buy a 2nd hand speedo from eBay and clone your existing speedo?

Cloning

It’s actually not all that hard to do. Depending on the method you use and the tools you already have, it could cost you less than £10 for the tools. You will have to buy a 2nd hand speedo. Take a look on eBay.

Take the old speedo apart, right down to the bare PCB. Circled below is the chip we are interested in.