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Old 03-17-2015, 12:55 PM   #1
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325 Chevy 454 Pressure and Temp sending units

Can somebody tell me exactly where the sending units are located for the coolant temperature and oil pressure are located on the 1988 Chevy 454 engine. I think the coolant is the one on the left side just below the valve cover. The wire is light green. There is a plug just above the oil pan that looks like a possible location for an oil pressure gauge sender. Thoughts?
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Old 03-17-2015, 02:07 PM   #2
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You are correct. One below valve cover in the cylinder head is the water temp sender. Lower one by the oil pan is the oil pressure sending unit.

Word of caution, replace these sending units with good quality parts. I had to do my water temp sender twice. First part was from Autozone. It did not work at all. Then got best quality from Napa. It wasn't fun draining radiator water twice!


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Old 03-17-2015, 02:11 PM   #3
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You mentioned a plug which is interesting. But sounds like location for oil pressure sender. It should also be on the left side.


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Old 03-17-2015, 02:14 PM   #4
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Yeah, just a plug. right above the oil pan about half way back. Looked like it might be a good place for a sending unit. Is the actual oil pressure sending unit located farther toward the front of the engine? Same side?
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Old 03-17-2015, 02:36 PM   #5
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Hmmmm... Auto Zone, huh? That is where I picked up the temp gauge. The gauge in the dash is apparently shot, so I need a gauge until I can get to the dash rebuild. I guess if I wanted simple, I wouldn't have an Airstream! LOL!
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Old 03-17-2015, 08:16 PM   #6
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on an '86 the oil sender in on the drivers side front and the water temp sender is on the intake manifold front drivers side. I've had mine in/out so many time.... I almost hate it:<(
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Old 03-18-2015, 05:21 PM   #7
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Just in time!
Thanks morlach for posting question, and to the great responses!
I've been working on my 345 and my oil pressure guage would fluctuate wildly!
Read the responses, and found my pressure switch, and found a poor connection and fixed it today!
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Old 03-18-2015, 11:59 PM   #8
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These were pretty simple. The coolant sensor was a bit tricky to get at, but I got it. Oil pressure was easy. The existing sending unit was in a T-fitting.
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Old 03-19-2015, 01:06 AM   #9
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Not a typical location for a 454 oil sender. Typically it is at the top center rear of the engine, (next to the distributor) just behind the Intake manifold.

I would have posted a wrong answer if I had been the first responder.


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Old 03-19-2015, 01:24 PM   #10
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325 Chevy 454 Pressure and Temp sending units

My oil pressure sending unit is on the front left lower side of the block just above the oil pan. Click image for larger version

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