I have a 86 and I have replaced the fuel tank and sending unit. Both are 17 gallon and are made for the el Camino. I believe the sending unit is a 0-90 ohm. My new fuel sending unit came with an eyelet on the black wire. I attached this to a frame ground for rear tails. Now when I turn the key the gauge reads empty. If I disconnect the frame ground it reads way past full. Question is on a factory setup does the red and black wires have rubber quick disconnects? Anyone have pictures they could share?