I have a mk1 fabia bohemia estate , I had an idea about fitting some VRS instrument cluster into the car as a replacement, just wondering whether this is possible? Any help greatly appreciated 

Anything can be done, the question is why would you bother? I think it'll need recoding at the very least.

Even if you managed to get it coded the rev counter and speedo scales are totally different between petrol and diesel engines (I believe your car is petrol).