I posted this same issue in the diesel forum earlier and realized that I was in the wrong forum.

On my Mercedes E320 wagon, I noticed the three wires are open and frayed, cracked near over the top of the oil filter. I believed it is connected to the firewall x27 in front of the oil filter. I need to know what is the name and part number of this particular wire harness. The oil warning light cames on in the instrument panel cluster and goes away after awhile, like 10 minutes or so. In addition, on the instrument cluster panel, the oil pressure needle is sloppy around. I don't think it is the postive battery cable. I also researched the issue and found out that in addition to the main wire harness that is part of the infamous biogradeable harness, that particular wire harness is also subjected to the biogradeable issues. Does this particular wire harness goes to the oil sender unit/sensor as well as the oil pressure unit. I don't know if I have to replace the oil level sender, part number 124-542-00-17 and/or Sender Unit Oil Pressure Sensor 0065429417.
Can anyone shed a light or two on this issue?