145 mph speedometer?

[kidsixpack]

I've been seeing these for years periodically, but quite a bit on cars advertised for sale lately. I know the GN's and T's came with 85 mph or digital dash.
I've see Canadian cars in kph. IIRC there was a replacement cluster that read 160 mph back in the day. Is the 145 mpg speedo an overlay on top of the 85 mph?
KID

 

[ScottHeidinger]

It was a overlay with a reducer sold by many vendors 20 years ago.

 

[fast86gn]

I have the 145 speedo overlay but I never used the reducer. I had a Speedo shop recalibrate it so the mileage would stay correct.

 

[kidsixpack]

Ok thanks guys!
KID