I have been having a few electrical problems for the past little while. First about 1 year ago I replaced the fuel sending unit. I tested the unit and the wiring to the gauge by connecting the two sides of the wire at the tank together. It still never worked when hooked up. Sometimes it moves from super empty to about 1/8th tank. Recently things have gotten worse. The lights behind the dash to show the gauges at night don't turn on and only the red oil light turns on before ignition. The dome light now works sparatically when the door is opened. My thoughts are a ground somewhere is not right. Where would this ground be? Or What else should I try?