After owning a T25 for eleven years I have just purchased a VW Westfalia California. It is fantastic. The only thing is though the odometer and clock are in kilometers - Is these a way to convert to miles.
I have got dehler maxivan it too had a speedo in kph. I got hold of a speedo off eBay and replaced it. You will need to take your steering wheel off to do it. I wouldn't attempt this if you have got an airbag fitted