[TimT]

You know the deal

What brand is the head unit

What model is the head unit

Is this KPH displayed using the head units native navigation app?

Or, is your phone connected and an app like Waze being displayed?

Android Auto requires a wired (usb) connection between the phone and the head unit, very few are wireless... Note, this is not just connecting the phone via bluetooth to be able to make phone calls...

Changing units of measure is just a tic box in some settings drop down...you need to find which one..

And we need more info to be able to help