Any import dealers can change the speedo for you.
There are 3 methods.
Change just the face. About 10-20 Pounds in parts.
Attach an electronic unit to change the speedo pulse (if the speedo is elec one) About 120 pounds in parts.
Attach a gear converter to change the speedo calibration.
You should be able to buy any of the above.
Personally I wouldn't go for Japanese import NSXs. (Other cars are OK, I am an import trader myself). The reason being NSXs are more expensive in Japan, so if you found one cheaper than UK models, it is highly suspicious.
I have been involved in helping stolen Japanese cars from Japan returned to owners. And NSX is one of the cars that are popular in stolen lists.
In Japan, cheapest NSX you could buy is probably automatic model 1990-1992. Goes for around 2500000 Yen. (even trade)
5 speed models always fetch 3500000 Yen atleast. 3000000 Yen examples are very poor.
Shipping is around 500 pounds. And Duty + VAT is (10% + 17.5%) which is chargeable on price of the car AND on the shipping cost.
So, quick calculation for auto model, is atleast 18000 Pounds. On top of this dealers will charge transport fee etc.
If you really want one from Japan (the Japan only models like Type R) then I could help you get one. (Only if you collect from the ports)
