Fuel Gauge question

My last two threads were monumental failures on my end, so here's hoping I get this one right the first time.

Welcome to the inside of my fuel gauge. Before disassembling my 1967 Dodge Dart 270, this gauge would work ... intermittently. Sometimes it would read with reasonable accuracy; at other times, it would read empty. When I took the car apart and dove into the dash gauges, this was what I found - a loose wire that is not making a connection. (I ever so gently moved the wire for the photo to emphasize that it is not making a connection at all.) Three questions.

1. Do I need to send this away to be rebuilt? If the repair is easy, how do I do it?
2. I will buy a new sending unit for the fuel tank (it is a necessary purchase in my case). Do I need to have the gauge calibrated, or will it read accurately without calibration?
3. Where can I get a new orange needle for the gauge? (The pic makes it appear that it only needs to be repainted, but the end is bent up pretty good and is ready to break.)

Thanks!