New temperature sender and gauge installed. Truck warms right up to 190 with no problems. The only thing I noticed was when stopped at a light, the temp would drop. But that's probably because I had the heat on full blast to keep my buns warm. So overall, score one for me! Thanks for all the help everyone!
But... hahahaha, when I drained the coolant this time, it did have a brown tint to it. Took it inside, under the lights, in a clear container. Light brown. Not sure if it's rust from the radiator, or oil. Will keep an eye on the coolant levels. Also, when it warms up outside, I'm going to change the oil and check it out, too.