K so I got the gmos-04... it doesnt use any of the RCA's, it wires up wire for wire same as the gmos-01.

And yeah, it works great, I havnt seen my gauges die once yet and the amp is noticably bumping lol.

One thing I dont know about is that with the other 2 harnesses like 10-15 was really loud... I was afraid going past 16 or 17 would blow my speakers. But with this gmos-04 it's a lot quieter, like 25-30 is really loud now and 15 is pretty quiet... I dont much understand that.