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Hot Rods Mechanical oil pressure guage fitting size???

Discussion in 'The Hokey Ass Message Board' started by dogwalkin, Dec 11, 2020.

  1. dogwalkin
    Joined: Jan 17, 2013
    Posts: 91

    dogwalkin
    Member
    from tn

    I was curious if anyone had identified the thread size on the back of the summit oil pressure guage?? I'm sure its like a lot of others on the market.

    I checked and it is not 1/8 npt.
    I was hoping to fix me a line because I will not use that plastic tubing.
    Thanks !!!! 1211201211.jpeg

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  2. 51504bat
    Joined: May 22, 2010
    Posts: 3,012

    51504bat
    ALLIANCE MEMBER

    The oil pressure gauges I've used use a compression fitting with the ferrule that goes over the copper line.
     
    rockable likes this.
  3. lake_harley
    Joined: Jun 4, 2017
    Posts: 1,528

    lake_harley
    Member

    You probably know this already but it will take a nut and ferrule for a compression fitting as I'm assuming you want to use soft copper tubing? I believe the tubing would be 1/8" copper.

    Lynn
     
    The Magic Ratchet likes this.
  4. jimmy six
    Joined: Mar 21, 2006
    Posts: 9,954

    jimmy six
    ALLIANCE MEMBER

    If you’ve got a good auto parts store by you with a Dorman supply drawers ask if you can check the threads against your for the slide ring compression fittings which what it looks like.
    Did Summit have the sealed plastic bag with fittings because I’ve used their oil pressure gauge without the plastic line and very small copper tubing with a compression sleeve. It could be metric today. good luck
     

  5. dogwalkin
    Joined: Jan 17, 2013
    Posts: 91

    dogwalkin
    Member
    from tn

    It came with the ferrules for the plastic line and I know you can get copper line.
    My question is is the copper line ok?
    I seen online they have a stainless line with a n
    fittings

    Thanks for the help


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  6. I have been running 1/8" copper tube on these gauges for many years, and just used the ferrule (usually brass) supplied with the nut. Sometimes called "nut & olive" if you are searching for them. Many times the thread on the nut is not anything I can ever find on a thread chart, I'm sure some of the manufacturers "make them up"!
     
    seb fontana likes this.
  7. Wrench97
    Joined: Jan 29, 2020
    Posts: 469

    Wrench97

    Stainless cracks easier then the copper which cracks easier then the nylon, but both metals hold up to heat and abrasion better then the nylon.
     
  8. Fordors
    Joined: Sep 22, 2016
    Posts: 3,836

    Fordors
    Member

    Whether you use nylon or copper tubing don’t get gorilla when you tighten the nuts. Too tight and the ferrule can weaken the line and it might crack- tighten, check it and chinch it up a bit more if necessary.
    Route either type of line through a rubber grommet if passing through sheet metal and keep nylon away from anything that gets very hot.
     
  9. squirrel
    Joined: Sep 23, 2004
    Posts: 49,777

    squirrel
    Member

    great advice above. Also, put a few coils in the line near the firewall, on the engine side, to help it flex.
     
    Jokester and The Magic Ratchet like this.
  10. Glenn Thoreson
    Joined: Aug 13, 2010
    Posts: 254

    Glenn Thoreson
    Member
    from SW Wyoming

    It uses a standard 1/8" tube, nut and compression ferule. That should have come with your gauge. If it only had nylon tubing you can purchase copper tube at most good auto supply stores. I've found that the nylon tube is a lot better than it's reputation suggests. Your choice, though.
     
  11. squirrel
    Joined: Sep 23, 2004
    Posts: 49,777

    squirrel
    Member

    if you can keep the nylon away from the exhaust, and sharp edges, it's fine.
     
  12. dogwalkin
    Joined: Jan 17, 2013
    Posts: 91

    dogwalkin
    Member
    from tn

    Awesome guys thanks for all the help. I'm gonna get them installed this weekend. Trying to make a good cruiser.
    1965 pontiac bonneville 4 door hardtop.

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