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12-19-2009, 07:25 PM
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91 s-10 pegged out oil pressure
91 s-10 pickup 4.3L engine,
oil pressure guage pegs out past 80 psi when running drops zero when off never any lower or different. whats the culprit? the oil sender or the guage? surely a common issue in the late '80s early '90s ive seen this before several times i know 199k and running strong every day. thanks 
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12-21-2009, 06:08 AM
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I would change the sending unit first before going any further.
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01-02-2010, 01:32 PM
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what i figured tooo thanks
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01-03-2010, 11:04 AM
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Sounds like somebody put in a sender for the idiot light, rather than for a guage,
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03-22-2010, 06:39 PM
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so definitely sender unit yeah?
thanks! 
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03-23-2010, 06:38 AM
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I would say, definitely the best first step,
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03-25-2010, 07:11 PM
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how can i test it with a volt or ammeter or resistance in ohms, or?
its a stock factory 1991 one is it the one threaded into the engine block driver side down low?? yes? is it technically called the oil pressure switch, or sender? thanks!
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