Though a faulty gauge is not altogether urgent, my wife thought it would be good to have it working before our trip to the coast next week. Have just abount finished restoring Zoey (our 76 280Z). When I purchased her, the gauge would work periodically. Now, it just stays all the way to the left. Am looking for help on how to diagnose the issue. Here is what I have done: 1. Replace the fuel sending unit with a new OEM unit. (no help) 2. Removed the gauge and inspected the connections...and also cleaned the points. 3. Connected a 9-volt battery (+ to yellow and - to black). The needle moved slowly to the "E", but not any further. I thought that perhaps that was good...and that there simply was not enough amperage to move it further. 4. Reconnected the gauge and turned key to "On"...moved just a smidge...but not even to the "E". 5. Disconnected the connector at the fuel sender and jumped the black to the yellow wire. Barely to the "E". 5. I get a strong buzz on my craftsman volt/ohm multimeter when testing for continuity from the black ground wire to the frame. 6. Not sure this would be accurate, but checked for voltage on the yellow wire at both the meter and at the sensor connector...there is NO voltage. 7. Checked the fuses...all are good. 8. Spinkled mojo dust and rattled the chicken bones...no help. Any thoughts out there in how to test the gauge? Can I hook up 12vdc to the yellow and ground the black wire...or will that blow the thing? Or should there be voltage at the yellow wire? Looking at the FSM, I see no voltage going there. All other gauges work...except the clock (of course).