Speedo giving incorrect reading

[mymps3]

Hi guys. Ive been frying my brain for months trying to work out a solution to our speedo's being out. I found a very easy solution!

You need to obviously remove the speedo from the car.. The top plastic bit above the speedo will just clip off.
You need to remove the drivers side trim bits and there are also a few screws that hold the bottom of the speedo.. Im sure you can work out this bit.

Once you have the speedo out you need to remove the 4 outermost screws to remove the black rings. Remove the black rings. Then, unclip the perspex part and remove it. Take your time, it is not a race!

Put the speedo back in your car with the perspex and black rings still REMOVED.

Put a GPS or equivalent on the windcreeen and go for a drive.
All you have to do is SLIGHTLY adjust the needle. Don't try to remove it (like I did!) cos then it might go a bit jerky.

It took me about a hour to calibrate it.

I firstly got the car to 100klm acording to the GPS and then adjusted the speedo accordingly.

It takes quite a few goes to get it spot on, but now my speedo is about 2% out at the lower speeds (like 40klm).

At 100klm, 90, 80 it is spot on!

Now I just have to get used to it being accurate and not adding those extra klms on it.

Hope this helps!

Greg.

[LittleredMPS]

Or you can go up one size in the diameter or your rims, but keep the same profile and width of your tyres.

This will bring you to within about 1% of a true 100km/h.