Hi
With regards to the MFA & Rev counter:
This is a very common problem with post 1990 golfs, unfortunately it cannot be repaired cheaply as the whole instrument panel needs to be replaced.
A company (the name escapes me) repairs them for ?140 + VAT(!)
It's cheaper to get one from the breakers but they are very rare, you need to ask for the single 24 pin units.
I have one for sale, let me know if you need it.
shinecello@hotmail.comR