digital dash

[tom poynton]

Can anyone shed some light on the astra digi dash please......

first of all what is the small red switch on the top of the unit numbered 1 & 2 ????

I have one unit where the speed changes from miles to kilometres whenever it wants to and another 1 the speedo doesnt go over 20 mph, just wondered if there was interchangable parts on them, or what would be best to check out

thanks