Speedometer works incompatibly

Friends speed indicator works incompatible (1999 206 GTI), while the model goes with 120, the indicator shows 95i and the difference becomes clearer as you speed up. what is the problem? How can I fix?

I don't fully understand, but there might be a problem with the panel.

but the electrician understands this. show it to an electrician

Did you compare with GPS?

I have compared with GPS, we have looked at other vehicles, but it is wrong. For example, while the end of the 3rd gear is a speed value of 140 in our vehicles, I go up to 115 according to the indicator at the end of the 3rd gear :) the speed value increases as I accelerate :) I think it may be from the mileage sensor friends?

Ibre-related

I think it has a calibration setting.

how can we adjust the calibration?

Normally there is a difference of 2 km. but you have a lot of difference. what are your tire diameters original?

How can we adjust the calibration of [QUOTE = Erhan_Gti]? [/ QUOTE]

I have a rc rim. but the trouble is reaching a value like 140 kmh in 3rd gear, even our vehicles show a value like pointer 115 completely wrong

I still couldn't find a solution to the problem.

I had a similar situation, master. I have 206+ 1.4 90 horsepower with a chip, normally 1800 revs, at a speed of 100 kmh in 5th gear, it showed in 90s speed. we found that there was a minor problem. Unfortunately, the sensor and calibration settings are not something you can do, because the set with the indicator on the front panel is removed as it is. After doing the adjustment, the situation in me improved.If you are in Ankara, you can get an appointment from the Peral Peugeot service and give it in the morning and take the car in the evening.You will understand the problem of dealing with something else, so there will be no expenses :)

I understand, but I'm in Istanbul, thanks, my master, I need to find a service that can solve this for your half in Istanbul :)