Trying to organizing my wiring - Accessories that is

[105-1006199262]

Okay.  Here's the deal.  I've got a few accessories that I've been wiring the power sources around fuses in my fuse box.  Gonna try and list here..
1.  Indiglo gauges
2.  Alarm for my lights
3.  Second horn
4.  Additional interior light

I wanna organize it a little though.  The indiglo gauges have to remain on the fuse box because they stasrt when the car starts, ditto with the light alarm.  But I can move the second horn and interior light directly to my battery right?  Now if I run the power source straight from my battery, can I use a thin wire with an inline fuse holder and I should be okay? And will there be constant power or will there only be power when the car is turned on?  Where's the best grommet in the firewall for that too.  The best one I found was right above the clutch but that's on the other side of the battery, I don't think it'd be hard to wire it around hte outside of my hood though.

[Spec]

there is a hole in the firewall on the passenger side, this is where all my extra crap is ran through.  It is just behind the passengers carpet at the top of the carpet.  It does have a rubber fitting in it you will have to pop out.  It is kinda hard to see from under the hood, but if you have a flashlight you will be able to see it.  Hope that helps...