Make sure you upgrade the filter to rail connection to -6an line. The stock banjo bolt is a restriction point.https://www.extremepsi.com/store/product.php?productid=20846
I run my aem gauges on 5 amp fuses. Good to have a fuse inbetween the relay and the gauge for extra safety. Guess thats what they want there to protect their electronics. I wouldn’t guess it’s needed. But i would follow what they say for installation for warranty purposes.
You’re going to have to cut those wires and test them with the low beams turned on and wire it to the correct. Were they working fine before? Kinda sounds like someone spliced the high beams into the low beams or the highbeam plug on the low beam side. What bulbs did you get?