34.539 miliamps is only 0.034539 amps. A 16 gauge wire will handle that.
You need to know the current to determine the wire gauge.
Yes, they sell just about in home wire you will need.
Depends on what you intend to do with 18 gauge wire. Your question is very vague. You need to be more specific as to what you plan to do.
4 gauge
The lower the voltage the larger gauge wire you will need to get the same power.
The size of the wire is stated by its gauge under American Wire Gauge. Six gauge wire is size 6 AWG.
Wire gauges are defined in such a way that the lower the gauge, the thicker the wire. So, 8 gauge wire is thicker than 10 gauge wire.
8 gauge is very common and really all youll need but i prefer 4 gauge its alittle more spendy but its good. make sure the amp wire holders will fit 4 gauge if you go with that.
eliminate the resistor wire all together but you want to run a new larger 12 gauge wire into the same circuit , in order to do that you need to take the fuse box down inside the car and you will see where that resistor wire ties into a big wire in the fusebox, it comes from the ignition switch, you need to tie into that big wire with your 12 gauge wire that you have run from the HEI.
Yes, the smaller gauge number, the larger the wire is.
Yes, you splice a small length of 16 gauge wire to 18 gauge wire for a repair.
A #14 wire will do the job.