ok after i put my engine in a few days ago i noticed my fuel pressure gauge was acting up, and i thought it was just the gauge but after i got my radio hooked back up its not the gauge, the radio (amp powers all speakers) will get loud then soft then loud and soft and when it gets soft is when the fuel pressure gauge acts up. I'm just looking for some tips to hunt this down. I'm guessing a bad ground? may be power wire?