Quoting Removed, click Modern View to seeTMo, your tractor must not be a 2000 then, since removing the wire from the oil pressure switch ('sender' you called it) will result in light never coming on, since that is where light gets its ground. I guess it could fall off & touch the engine for ground & light up.
It may be easier/more comforting to temporarily replace the oil pressure light switch with a mechanical pressure gauge for short period of observation. If all is well then, tackle the switch, wiring, light problem. If not tackle the loss of oil pressure problem before engine destructs. That would & has been my approach.
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