Speedo reading

[Numplumb]

Hi anyone.
I have a 1600 Mx5 Mk1 engine fitted and the speedo is in Km/h, I bought a new cluster from a Mk2 that has the electronic speedo instead of a speedo cable, does anyone know if.
A) The speedo sensor in the gearbox of a mk1 (cable) type can be changed to the electronic type?.
B) Can the face of the speedo in Km/h just be changed for one in Mph, or what needs to be done to speedo?.
Cheers Mick.