Lionel Pre-War 8E Standard gauge repair diagrams Lionel Pre-War 8E Standard gauge repair diagrams, illustrations or tips. Lionel Train Forum - Lionel Trains Lionel Train Forum is the Source for lionel On that wiring, if it's old/original wire, just unsolder one end, slip a piece of shrink wrap over it , Shay Reproduction Gas Gauge Wiring Diagram Yes, you can hurt a fuel gauge by wiring backwards. (See diagram on the next page for connections) Standard Case 3. Connect a wire to the gauge stud marked “S” (signal) and secure with nut and lock washer. Connect opposite end to the fuel level sender’s signal wire or terminal.