had sat nav in my car last night and noticed my speedo is showing 90mph when the gps was saying 70mph. i have the yellow box in my car. was wondering if anyone can give me the settings? i have 4.56 gearing with 255/35/18 thanks

 

Instructions can be downloaded from Here!

When I did mine I got it close and then fine tuned it on the A1 with GPS.

 

thanks. have a bit of a problem it seemed that it was a loose wire. which has reset the box? so i unplugged the yellow box and connected it up again. now i have engine management light on . how do make the light go off?

 

Disconnect the battery for a few seconds

If it comes back on, you have a problem; in which case, get it read.

 

thanks will try that tommorow

 

I had trouble earthing mine properly, you really need a good earth connection