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Ground the 705 wire at the sender to see if the light goes out. If the light goes out then the sender is bad or no oil pressure. Wire 705 is the sender and 10 is the ground. This goes to connector 701 engine harrnes and to connector 402 which is the cab harness on the right side of cab to connector 509 is the warning display panel. If you ground the 705 wire at any of the places the light will go out. If not then the display is bad. If the light goes out at one and not the next then the wire is broke.