65 425 Oil sender unit NPT size

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Old June 14th, 2016, 08:10 PM
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65 425 Oil sender unit NPT size

Hey All, I'm going to plumb a mechanical oil gauge into my engine, my question is does anyone know the NPT thread size of the sender unit where it goes into the block? Thanks!
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Old June 15th, 2016, 04:00 AM
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My gut says ¼", but I am not completely certain.

- Eric
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Old June 15th, 2016, 06:37 AM
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Originally Posted by MDchanic
My gut says ¼", but I am not completely certain.

- Eric
Your gut needs calibration. The oil port on every 1964-1990 Olds V8 block is 1/8 NPT.
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Old June 15th, 2016, 06:38 AM
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I've always had trouble visually estimating NPT sizes - the actual diameter of the nipple is about double the nominal size.

- Eric
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Old June 15th, 2016, 06:50 AM
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Old June 15th, 2016, 09:51 AM
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Huh
real numbers
No wonder JP knows all... he has all the inside info!


I always just called 'em
The little one (1/8)
the big one (1/4)
little finger size (3/8)
finger size (1/2) and
thumb size (3/4)


turns out there is also a 1/16 pipe thread- I have some large qty of plugs for that- and they make straight [not tapered] pipe thread think 1/8" for lamp parts). I have 1000 nuts for that thread if you know anyone that makes lamps out of car parts or whatever. pay the shipping and it's yours.
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Old June 15th, 2016, 10:18 AM
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Originally Posted by Octania
Huh
real numbers
If you're really clever, you'll scale that on your printer to full size and tape it up in the garage.
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Old June 16th, 2016, 03:31 PM
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Wonderful! Thank you!!
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