I have a dolphin 5" Quad gauge in my 37 Ford dash. I bought them last year and can finally put them in. My problem is that I have power to the gauges, but the Volt gauge does not move. I even ran both the Positive, and the Negative from the harness directly to the battery, and no movement to the Volt gauge. The oil gauge bumps, and the fuel goes to the top. I don't have the fuel sender hooked up yet. I want to start the engine for the first time and I would like to have a Volt gauge. I contacted dolphin gauges. I was told from them to loosen the nuts on the back of the housing.. Does that make sence?? Do you think the Volt gauge is bad??