Inaccurate speedo.

Hi guys, noticed when going fast the speedo from about 80 - 90 starts going ballistic saying 136 121 ? All over the place.
Recently had Akra mapping done so don't know if thats had anything to do
with it ?
Havent had this 2nd SD long and didnt really cane it to notice speedo before
Akro's and re-map.

when you turn the ignition on does it say 17 before your display comes up?

the 17 is the wheel size if you have it on smaller wheel size the speedo is innacurate.

Follow the manual to change it back.

If it is on 17 you have a problem.....
The speedo runs off the bolts on your front brake disc.

Checked all disc bolts, all ok, checked connections on battery ok.
Mate said the sensor is magnetic and might have dirt on it, so have give it a
clean.
Just need to take it for a spin now when weathers ok and see if alls well ?[/quote]
Ok, took it for a spin today, speedo's lookin good, so the clean with the cloth on the sensor seemed to have done the trick.