I'm reinstalling me gas tank after being restored/repaired by PI motorsports up in L.A. I thought I took a pic of the wire hook up but, I forgot I guess. My wire diagram is not even close to what I have. Here are some pics.
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The white and black wire (white on Cuvee's Pantera) is the fuel level signal. The yellow wire is the low fuel warning light and the black wire is ground. The terminal in the center, on the early sending unit, is the ground terminal.