I've got a hotwired 340 installed in my car now and have a double pumper I'm about to install. I'm assuming it's fairly straightforward installing it with the hotwire kit already there but for the second pump and I have some questions. I already have the hobbs switch and have a trunk mounted battery. Would it be acceptable to wire the second pump from the battery instead of running another hotwire up to the alternator? Are all fuel pump relays equal or is there a better/more reliable brand?