Check for a place where the wire has had the insulation rubbed off, like where it goes over a steel line or through a gap in the sheet metal. I want to think that my service manual for my 7000 with a 301 says it's like a 3 or 5 psi cut-on for that switch (which means that it simply grounds the wire so you have a completed circuit through the bulb). I'm not familiar with where the sender is on a 426, but it should be somewhere on the block where the oil gallery is. The 301 has it tucked away behind the fuel filter and it's a pain to see and get to. To check the switch, see if you have an open circuit when the tractor is running (resistance is infinite between the lead on the sender and a ground).
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