How many different types of speedo clocks are available for sierra cosworths.

My car still has the original clocks fitted, and I want to keep them and I am trying to look for a replacement set of clocks to tinker with.

So far I have seen clocks with a boost gauge in the corner? – RS500?
I have seen ones with number son the fuel tank markings.
I found a set that look identical to mine…..but have no redline, on the dial faces

Are all the clocks the same, ie same type of rev counter etc?

As I am looking for a set to go into my late spec 4x4 saff, that I can try out a new set of dial faces etc

Any help with whats what??

Cheers