164 Help!

Any ideas on tempramental electrics? i.e. LCD for temp in center, interia lights, sunroof, opening boot button, electric mirrors, lighter socket, aeriel, fuel gage. Only essential things work like it goes, stops, has all lights functioning, and de-mists! Is it possible to fix all these other non essential things ?????????

Also would it go any better without air con, or should I fix that as well?

Can the hand brake work for more than 1 week after an MOT?

Any up graded bits available that aren't too expensive? I need to do disks and pads any way!

I have done exhaust, engine top mount, springs, and a few suspension bits, as well as servicing before. I don't think I know anything useful much but if I can help I would!

Any advice most appreciated. It's too late to stop though! Anybody else trying to keep a tired 1990 12 valve alive out there?