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Learning the HARD way...
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I had a similar problem with my Universal diesel. My engine has a separate oil pressure switch (for the beeper) and oil pressure sender (for the gauge). The switch and beeper were never activated, but the gauge would read 50 PSI at start, then slowly drop to < 10 PSI. The problem was that heat from the engine would warm the sender, and increase the electrical resistance, and give me a (false) low reading. I put a new sender in, and moved the sender away from the exhaust riser. Problem solved.

If you have discrete sender and switch, yet are seeing low oil pressure, and triggering the alarm, then I would look carefully to see if you have adequate pressure (test with a mechanical gauge) before swapping anything. However, if you have a combined sender and switch, then I would order a new one and replace as the first step.
 

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Learning the HARD way...
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7,699 Posts
I hope that you bought your "homeless buddy" a meal to compensate him for his consultation. :)
 
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