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Oil Pump

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It's been awhile since I've been on.  I have a 2003 Response Lxi, almost 500 hours, and have a question about oil pump and pressure. I've noticed that my oil pressure fluctuates down pretty low where the alarm will sound and then shoot up to above 60. It's not a consistent pressure reading.  The only time the alarm went off is during a long idle period while waiting for someone to gear up for a ski.  But when I'm running 32 mph for a long period of time the oil pressure doesn't stay constant. Is my oil pump going out? Is replacing an oil pump a major mechanical issue?  Thanks 

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I could be wrong but I thought that for that model year the sender only gives pressure info to the dash gauge and a separate switch triggers the alarm (via the ECM.)  If the alarm is going off AND the sender is showing low pressure you may indeed have a problem with the pump.  The sending units are known to fail in this manner and it is a simple swap, just DO NOT use teflon tape on the threads.  Just bring the old one in to be sure but ask for the sender unit on a 1999 Chevy Suburban 350 and it will be a match (if yours is as pictured below.)



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