C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Feb 7, 2009 | 12:53 PM
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Default oil pressure sender

My oil pressure gauge has been acting very erratic, needle bouncing all over. I replaced the oil pressure sender and now the needle is pegged on the high side. The new one has a much larger inlet for the oil than the old one. Would this cause a misreading?
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Old Feb 7, 2009 | 01:20 PM
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Did you use teflon tape on the threads? Don't!
The unit is self grounding and must have contact with the engine block.
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Old Feb 7, 2009 | 01:39 PM
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Sounds like they gave you the wrong unit. If the old one was erratic it may have just been the connector on the wire. The new one might be just a oilpressure warning switch instead of a sensor. Put the old one back in and make sure the wire on the unit is secure. You can use teflon tape but only 1 wrap. The sender threads will cut thru the tape and push it into the voids between the threads. If you put on 2 or 3 wraps it might not and can isolate the ground connection preventing the gauge from working at all.
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Old Feb 7, 2009 | 04:09 PM
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I got the one for a light. Thanks
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Old Feb 8, 2009 | 04:39 PM
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Originally Posted by painterman52
I got the one for a light. Thanks
Get a new parts store. C3s never had just a light.
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