Low voltage, Oil PX over-reading, fuel gauge stuck at 3/4

[COL BRADDOCK]

I have run into some false gauge readings. Im showing low voltage (battery charged, oil px is reading high, fuel gauge is stuck around 3/4. Its a gremlin because once in a while the gauges jump right back to normal. Could there be a common ground or wire all these gauges run off?relay?

98 4.3L GL Volvo Penta

 

[dingbat]

You have a grounding issue. Need to find the common ground to the gauges

 

[COL BRADDOCK]

I figured so. Where can I find the common ground? Instrument cluster or on the block?

 

[Scott Danforth]

start at the back of the gauges and follow the black wires.