Ignition on power in a 65 dart

I would:

For gauges, identify the ignition "run" wire from the key switch, tap into it, perhaps right at the key, add a small fuse, and run power to the gauges
For gauge LIGHTS, run them off the dash lights same as the rest of the dash. Get into the fuse panel, look for a fuse at one end which has "a bunch" of orange wires. These are the feeds to the dash lighting, controlled by the light switch dimmer

Radio depends on whether you want it "full time power." If you want it switched off the key, and if it is not a high power stereo, just a "normal" in dash radio, hook it up to the same plug the OEM radio connected to. Look for a "T" shaped connector with one orange wire (which is the dash lghting) and one other wire, likely red

You cell charger, don't you want it to be "on" at all times? How about the cig lighter?