Sorry I can't help with the dash lights, but I've got another question for you.
I have the same amp (Kicker IX404) as you, how do you find yours powering 2 Phoenix Gold subs? How are they connected?
I have 1 Alpine Type-R 10" bridged across the 2 rear channels in the trunk, and even this doesn't get enough power to create particularly noticeable bass when cruising at speed. With the windows open you'd never know it is there. It sounds alright when stopped with the engine off though.
At the point I do get distortion, it's the amplifier's lack of power that is causing it not the sub (this is the case if distortion sounds a bit like gravel-in-a-pan).
How is your bass and how are your subs mounted?
thanks & later
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black