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For the Dash lights, I would first check the Rheostat (The fader control). Usually, it's very uncommon for all the lights to burn out at once, and those rheostats fry like nothing. What you can do for that, is simply clip the ends of the wires that go into the rheostat, and connect them all with a wire nut. (First, test to see that is is the rheostat buy just holding all 3 connectors together.)

Other then that, you will have to take the dash apart to change the lights, or get at the rheostat wires, but it is very simple. (Someone can probably give you better instructions on how to get inside the dash with your year, I take my dash apart in my '80 245 quite often, but they did change the design in '81.)

For the heater gauge, for some reason, the gauges in later years are terrible. I use to have a '89 245, and that thing would go all over the place. I've never had a problem with that in my '80 245 though. I never got it taken care of, so I don't know where to tell you to start.