If your fuel gauge works fine I would susspect a bad sensor or loose/broken wire.
If the floor is clean of rust I would venture to guess that the frame would also be good. The flaw of these frames are that they ar full of holes, but the holes are too high in the frame. This alows dirt and road grime to acumulate in the frame trapping humidity. My suggestion to protect is to try to pressure wash the best you can and get the inside of the frame under coated. Then keep cleaning every once and a while to keep it free from dirt build up.
Some people say the manifold will only get worst with time. I've had a slight tick for about a year and a half it hasn't gotten worst. I haven't noticed any other problems that this would have been the cause of either. Maybe I'm just lucky, I don't know.
In your previous post you mention roller switch on the dash. Does it have any marking? I have a couple of switches here. One for cruise, one for rear defrost, one for rear wiper and hatch release, but you mention all these work.
As for your lights. You mention map and dome. I don't have map in mine. Just the dome (one on the roof) and it's got a built in switch to turn it off or on. The door switches on these are common problems and they tend to start either not turning on via door or not turning off via door. This is why I turn mine on/off manually.