Quote:
Can I get by using 12V constant power, ground, and remote amp turn on?

Yes. But you would have to remember to put the empeg into standby mode before pulling it out of the dash. If you don't, you'll get a bad POP from the amplifier and speakers.

Remember that the remote amp turn on is something that you can run yourself, from the empeg to the amplifier. So really you only need +12 and ground.

Come to think of it, if it's your own amp, you should be running a direct wire to the battery anyway, so all wiring runs would be yours.

If you're trying to use the factory amp and speakers, you're back to the same set of questions about which wires are which.
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Tony Fabris