'88 K1500 Oil pressure Gauge not working

Could someone give me an idea as to why my oil pressure gauge appears to be pegged out all of the time. And how to possibly test it.
Thanks in advance

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be
Try unplugging it at the sending unit. H
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"Pegged" is what they do when the circuit to the sender is open.
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to
Ok....didn't know that. H
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the wire is GROUNDED !
climb under and follow the wire!
it may have just fallen off!
if not , replace the sending unit!, less than $20.00
karl
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The above two conditions contradict each other...
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How?
If it has fallen off and contacted ground, which is a scenario he describes.
Refinish King
PS When the wire is off and not contacting ground, the gauge will be at zero. Ground the wire, as the transducer does under different pressures and resistances to coincide with the pressure. The gauge will act normally.
wrote:

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That's the way it works.

If the sender circuit were grounded, the needle would be at zero, not "pegged."

Nope, low resistance = low gauge reading, high resistance = high gauge reading. An open circuit on the sender side of the gauge circuit results in the gauge being pegged.

Look up the specs for the sender... O PSI = 1 ohm Running PSI = 44 ohms.
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they peg if grounded!
they are dead if no current!
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Meaning that the needle goes to maximum...

From Mitchell On Demand;
"Sending unit specs:" Engine off (no pressure) 1 ohm Engine running (pressure) 44 ohms
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