1st and 2nd design oil pressure switch?
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HT4100 4.1, 4.5, 4.9 Discussion, 1st and 2nd design oil pressure switch? in Cadillac Engine Discussion; One has a 3/8 inch thread the other has a 1/4 inch. How can I tell the difference without pulling ...
  1. #1
    BLMDeville is offline Cadillac Owners Fanatic
    Automobile(s): 95 deville 4.9
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    1st and 2nd design oil pressure switch?

    One has a 3/8 inch thread the other has a 1/4 inch. How can I tell the difference without pulling the switch? And also what would be the best replacement part for my 4.9?


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  3. #2
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
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    Re: 1st and 2nd design oil pressure switch?

    Never heard of 2 different sizes. The oil lines and associated fittings should all be 3/8. In any case, you can simply buy the appropriate brass bushing at any hardware store to make the switch fit. Use teflon tape on the threads.

  4. #3
    BLMDeville is offline Cadillac Owners Fanatic
    Automobile(s): 95 deville 4.9
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    Thread Starter
    Rock auto list two different sizes and so does the stealership

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