The other posters have both mentioned the positive ground issue on the fuel gage. I have read here that it may be necessary to replace both sender and gage to make it function correctly. Do a search in the archives here for Jim in AK. he went through the whole rigamarole and posted the correct JD part numbers .
As for the lights, get a multimeter and check the terminals on the light switch. If they are putting out 12 volts in the correct position, them just connect a new, longer wire to a good portion of the existing harness.
As to powering the accessories in the cab I would use a Bosch style relay. To clean up the wiring I would look for a fuse block also. These parts should be available at a good automotive parts store. I would try to mount them on some sheet metal in the cab on the front left side. The relay should have a wiring diagram on it.
Wire the relay as follows. Run a heavy wire, say 10 ga. between the + cable on the starter and the power in wire on the relay. Run another heavy wire from the normally open output terminal of the relay to the input of the fuse block. One of the two other two terminals on the relay needs a wire to ground. The final wire must be hooked to a wire or terminal that has 12 volts only when the key switch is on. Make sure that any wires that have to go through sheet metal openings have extra protection such as flexible loom. You could also drill a hole and use a rubber grommet. The idea is to prevent the insulation from wearing out and causing a short.
Run wires from the fuse block to the various cab accessories. Hopefully with a good 12 Volt source they will work again.
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