The statement listed below is my opinions, yours may differ. I do not wish you argue about it, take it as it is or leave it. It's not my car you are working on, do things however you choose. I believe the statements and ideas below to be accurate, and could save your classic car or your life, use at your own risk, research and read others ideas, learn the load capacity of the wiring in your car before you take my word for it. Other people may have a different or better way to resolve the same issues. Viewer discretion is advised...
You know if you have a working old style Amp Gauge in that car, and you run that much Amperage through it, it will melt, or have a wiring fire. The gauge would be rated at either 45amps or 60amps. To run those electronics you will have to upgrade the wiring and bypass the gauge, and I'd run all new wires for the Positive AND Negative for the subs AND radio. Do not tap into the fuse box your car has or into the wiring your car has. Use new wiring and circuits from the battery. Too much load on wires (new or not) will cause them to heat up, melt and short out. I know most of the time people just ground the sub in the back, you can do that on a new car, and the Ground is usually good. But a 45 year old car may not have as good a ground so why take the chance of ruining the amp or sub due to poor ground wires, just run ground with with the hot so it has both wires new. Both wires the same gauge, direct from the battery. Remember to put the FUSE for the HOT side of the sub very close to the battery in case it shorts out at some time, it will just blow the fuse. Do the same thing for the radio as well, If you want it to turn on and off with the key use a relay to run the radio. It would work just like any other relay for lights, or a fuel pump. It will just run the radio, DVD player, navigation, or heated seat.....whatever, add as many as you like.
Or you can do what I'm doing for my car. I'm bypassing my amp gauge and upgrading the charging system and adding fuseable links. I'm then adding an under the hood fuse box (like new cars use) to run all my new toys. Oh and I think it's a 120 amp Alt that is going in. I'd have to go look at it, it's at the bottom of the pile, but could be a 160 AMP
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