It has it's own power ??? What is it battery operated ? The ones I installed always had wires coming off it that had to be spliced in. Never seen one that had it's own power before. Must be something they came out with in the past couple of years. I had one that had a little box you mounted under the dash that had a knob & you could change it to about 10 different colors.
But never one that had it's own power.
I guess it could be your alternator. Just seems odd it would go out right after you did the gauges.
Sounds like you're having several issues with that car from the posts I've read. Seems like it needs a good overhaul. You're probably better off concentrating on fixing the things that are wrong with it before worrying about Super Chargers & Cosmetics. The 1st year with my car I did nothing but fix everything I found wrong with it. Then I knew if the car was worth sinking my $$$ in.
2nd year...I did the Exhaust, CAI, 3-Core Radiator, Optima Battery & stuff Like that. Things I could Remove from the car should it give me trouble.
Now it's the 3rd year & since my car has 175 K mi.'s on it I decided to build a better motor for it & change out all my Suspension Bushings, Shocks & Struts.
My motor is 80% complete & I'm finishing up my suspension this weekend.
So..My Advice Is...Slow Down & work on it little by little.