Car: '11 Impreza R Special
Join Date: 1st February 2012
Location: NSW, Australia
Thanked 1,011 Times in 891 Posts
I do not think so.
The button is apart of the gauge cluster, do you not know how to do on the fly convertions?
As i think it will be a costly fix.
As it may involve a new speedometer that shows mph and the ecu just displays the speed.
I live in australia and we use km/h but i like to drive in mph, no speeding tickets.
A quick fix may be using your smart phone, just use the GPS or get an app that shows speed in mph and place it on dash so it reflects the speed on the window.