Funny, I was about to send the following as a puzzle, but maybe you'd be interested in this alternative:

I've got a Joker from the German market (so the odometer and speedometer only read in km), used by several owners in the US. Somewhere along the line, the speedometer was recalibrated or somehow altered so that it reads exactly twice (and not 8/5) my speed in mph. I've checked this against other cars and radar guns. When it registers 50 km/hr, I'm going 25 mph; 50 mph shows up as 100 km/hr.

So the "puzzle" is: since I don't have a tach, I've used the very-helpful-German shift point markers on the speedometer as a guide (You vill shift now, ja). But that means I upshift a little too soon, doesn't it? And who knows what the actual mileage is, since I've no idea when it was "fixed". 

I'm surprised there was that much room for adjustment. Doesn't seem like the difference between 16" and 14" wheels would be hard to handle. 

Stephen

> On Sep 18, 2017, at 7:26 PM, Dan N <dn92610@GMAIL.COM> wrote:
> 
> hi all,
> 
> I have here a Doka 16" imported from Germany, it has a speedometer with
> only km/h, I have no obligation to retrofit the speedometer but for my own
> convenience I will do it ... so I have  some choices:
> 
> 1. replacing the US speedometer face only... but the counter will register
> Kms only (not Miles)
> 2. replacing the whole speedometer with a used/rebuilt one, which certainly
> coming from a 14" van but will it be correct?
> 3. looking for a speedometer built for a 16"
> 
> so the question is there any difference between a speedometer on a 16" and
> a speedometer of 14"?
> 
> 
> thanks