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So, picked up my car from the garage after hours today, had it in to fit another gearbox, so far that seems fine, i now have a new set of problems, car car vibrates, a lot now, and the rev counter is behaving erratically, similarly like it does when the sparki plugs/HT leads are knackered, except i have extremely minimal and barely noticeable engine trouble, i don't think it'll be the leads or the plugs as they were replaced about 700 miles ago, just don't understand why this has happened and the only thing thats changed is the gearbox
any ideas?

maybe take it back to the garage? it didn't do that when it went in, it shouldn't do that when it comes out.

sounds like something is out of alignment or not balanced properly.

yep, taking it back tomorrow, people have said irt may be the clutch slipping, it had one 10,000 miles back, bu as you say, it was fine before. good thing i haven't paid them yet