Dash lights and rear tail lights often are the stalk switch, but first check the dimmer control in the lower dash section.

the fuel gauge wiring is possibly as mentioned before on another thread, but check all the connections under the rear bumper and around the tank - they do suffer alot of degredation and corrosion over the years

the other electrical issues could be down to the fuse box, which is another issue which catches out several escos owners, these arnt the end of the world to change, but make sure you get the right one if you decide to change it, or you could have it repaired.

personally i think it could be a worthwhile investment in getting it to a decent recomended auto electrician.

where abouts are you from?