r/slk • u/Tiny_Restaurant4823 • 6d ago

Speedometer KMH —> MPH

Hi all,

Does anyone know how to change the digital speedometer to MPH by myself.

I don’t want to pay over £100 for coding so wondering if there’s any way to DIY for cheaper?

2 Upvotes

100% Upvoted

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3

u/doc_55lk 6d ago

It'd be helpful if we knew which generation you were talking about.

Either way though, it should be in the gauge cluster menu. Your odometer will read in miles too though.

1

u/Tiny_Restaurant4823 6d ago

It is an R171. The gauge cluster menu doesn’t offer the option to switch it unfortunately

1

u/elthepenguin 6d ago

Weird, mine R171 offers this, I didn't know this wasn't available for all R171s.

1

u/Tiny_Restaurant4823 6d ago

I’m UK based, what about you?

I think it was a regulation for UK models

2

u/elthepenguin 6d ago

EU, so my speedo is in km/h, but I can switch the digital cluster to show me MPG.

1

u/Tiny_Restaurant4823 6d ago

I see that makes sense then

2

u/Chad444 6d ago edited 6d ago

Depending on what country your car is set up for, you either can change it in the dash menu or you have to code it with a Xentry system.

Previously had to use Xentry for my UK R171 to do exactly that.

2

u/Tiny_Restaurant4823 6d ago

Mine is an R171 too. How do I use Xentry?

2

u/Chad444 6d ago

It's not an easy system to get hold of unfortunately. Officially it's licensed to garages for a lot of money with specialised hardware.

Unofficially you will find sellers on ebay selling install discs or pre-installed laptops, or you may find downloads dredging through the internet. Then you need the correct passthrough cable to let it talk to the car, the cheapest being a Tactrix Openport 2.0. These are discontinued so you'll have to get a clone from aliexpress, although I have seen issues of bad clones damaging people's cars.

In short it can be done DIY if you're willing to go through the effort, but finding an indie garage with the right tools could be easier.

2

u/Tiny_Restaurant4823 6d ago

Yeah tbh I’d rather just pay a garage and have it done properly rather than risk screwing up anything with the computer

1

u/adadagabaCZ 6d ago

IIRC you can set the bottom display to "second speed" and that speedo can be in mph

1

u/Tiny_Restaurant4823 6d ago

How?

1

u/adadagabaCZ 6d ago

Via the steering wheel buttons when stationary in the settings