First and foremost, if you replace anything electronic then the value decreases.
Do the electrics work? If they work but look ugly, clean them. If they don't work, then you will need to replace them and solder them in. I have not replaced electronics on a guitar before - I may eventually try it out on my shitty Stagg but I wouldn't delve into a potentially vintage guitar without knowing what i'm doing.
You can get guitar polish for the bridge, you can fretdress yourself, and you can source replacement knobs (but probably won't be Univox).
Any pics?