BroncoMP

Hello all, I'm new to this so bear with me. I have a '91 full size bronco 5.0 with 200k+ miles. (I know, a lot.) I have owned it for about a year and a half and have so far been very pleased. I think it was the original owners baby, he still had the original window sticker and it appeared to be extremely well taken care of.
It drives really well but I believe I have a complex electrical problem. It really hasn't been much more than a nuisance unless you want to use any of the accessories, but fear it could get worse. the problem areas are:
the rear window doesn't operate at all; the door windows are very hestitant, esp. when closing; the temp. gauge is sporadic at best; the gas guage is inop; the clock/radio station display on the stock radio is inop, but the lights on the volume control, buttons, etc. on it work, and dim with the dimmer on the headlight switch; the cruise works usually, but sometimes won't let off when I brake, and i have to push the off button; the auto 4wd usually works, but sometimes i have to get under the vehicle to rap on the motor that operates the front diff (not sure of the technical term) with a mallet or pliers; sometimes the hazards work, sometimes not, obviously i don't use them everyday so i can't really monitor; also the heater sometimes blows cold air, esp. when idling. I think thats all. WHEW
I don't know if there is an overall problem, perhaps with the computer, or if its simply that vehicle has 200k+ miles and each problem should be handled separately.
I am in the army stationed in Germany and the Bronco just arrived here from shipment where it was in transit and idle for over a month. before that i was in germany waiting authorization to have it shipped it from the states (never, EVER, join the army) so it was sitting for a few months, but driven 2 or 3 times a week so not completly idle.
Any and all suggestions would be greatly appreciated. Thanks...