Lights flicker and gauge jumps around???

I feel your pain. Here are the pictures and part number. It's really funny that I bought it from a company named Roadrunner Electronics. I connected it to my harness and grounded it with jumper cables and adjusted the pot on the back for a max reading of 14.2 volts. Good Luck IMG_20160619_200854514-640x480.jpg IMG_20160619_201000209-640x480.jpg IMG_20160619_201000209-640x480.jpg IMG_20160619_201013462-640x480.jpg