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Okay, I had the cluster out of my '81 300TD to try to fix the odometer, today, so I lifted one leg of the resistor on the temperature gauge and measured it. It is, indeed, a 68 ohm resistor. Yours is probably the same *if* the temperature sender spec didn't change between '75 and '81. I don't know the wattage spec but judging from its physical size, 5 watts should be safe.
So, you need a 68 ohm, 5 watt resistor. I checked my junk box, and I unfortunately don't have one to give you.
If there's a Fry's in your area, they'll almost certainly have it. Radio Shack might but it's a long shot; they're mostly a cell phone store now. You could also order online from Digi-Key, but you'll end up paying $15 in shipping for a $0.50 part, if you do it that way.
You will need basic soldering skills to do the replacement.
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