Hi CF! I know this may seem like a dumb question but here I go. I installed and mounted my Isspro EV2 rail pressure gauge using the Isspro harness and the gauge isn't getting a reading/movement. All I have hooked up to the orange plug is the green and black wires from the harness. Does the gauge need the wire from the trucks ignition for the gauge to work? I was under the assumption that the 3 additional wires hooking up to the gauge from the trucks ignition,dimmer and ground was just for the gauge lighting. I double checked the Isspro harness as I read that those could be mistakenly installed wrong. Thanks for any info!