Oil pressure gauge

Discussion in 'Interior' started by Jerry phillion, Sep 23, 2017.

  1. Jerry phillion

    Jerry phillion Junior Member

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    are all orig dash gauges electrical or is the oil pressure gauge mechanical ? My PO has replaced my oil
    Gauge with a mechanical one. He put the oil gauge in the spacE where a clock would go. I want to
    Replace that gauge with a new orig one in the orig place. Any thing I should know before doing this?
     
  2. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Factory is electrical. You would need the sender and if not originally equipped you would need to fine the wiring. Just curious tho why remove a mechanical gauge?
     
  3. CSFJ

    CSFJ Magnificent Bastard Supporting Member

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    Probably doesn't want hot oil piped into the cab, or to match the factory gauges?
     
  4. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Meh if you use the copper line you should be good not that plastic shit that's just asking for trouble. Lol
     
  5. 74 Shortbed

    74 Shortbed Full Access Member

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    My 72 had a mechanical gauge from the factory and it came with copper line.
     
    Squirtthedirt and Honky Kong jr like this.
  6. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    That's what I thought the older stuff was mechanical. So much better and way more accurate.
     
  7. CSFJ

    CSFJ Magnificent Bastard Supporting Member

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    When I was into import racing, we used an a/n bulkhead fitting to pass through the firewall and then braided stainless line to run to the gauge. Iirc, the mech gauges cost less which I'm sure was the driving force behind our use at the time.
     
  8. Jerry phillion

    Jerry phillion Junior Member

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    Guys, I just want to restore dash to orig, beside I believe the
    Mech gauge is not right. The orig gauge is still in dash. I don't
    Know if it is any good or not. I will get new gauge, put in new
    Brighter bulbs and repaint the surround.

    Also, where is the sending unit located for orig gauge and what
    color wire should l look for?
     
    Last edited: Sep 23, 2017
  9. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Brown and behind the distributor. It was probably removed to install manual gauge. Find the brown wire. Turn the ignition on and ground the brown wire. If your gauge goes to zero it might be ok. And absence of ground will peg it.
     
  10. 74 Shortbed

    74 Shortbed Full Access Member

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    Yes sir, got that right..
     
  11. 74 Shortbed

    74 Shortbed Full Access Member

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    That is actually the best and safest way to do it, cost might of been part of it but I think reliability was the biggest factor, didn't have an electric sensor to take a shit on ya at 7500+r's and the gauge still read 80lbs when you really had only 10lbs...
     
  12. smoothandlow84

    smoothandlow84 Be patient with driver...this truck is bagged

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    Just make sure to use loctite 545 hydraulic sealant on the threads from the copper line to the back of the gauge. Nothing worse than an oil leak behind the dash, or even into the face of the gauge. Don't use teflon tape. I use loctite on all of my airline fittings for my air ride setup...no leaks..ever.

    1506216696617.jpg
     
  13. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    They use compression fittings?
     
  14. 74 Shortbed

    74 Shortbed Full Access Member

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    That's what was on my 72 both ends..
     
  15. smoothandlow84

    smoothandlow84 Be patient with driver...this truck is bagged

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    No compression fittings on air ride, but this same thread sealant is far bettern than teflon, even when used on compression fittings. A small droo is all thats needed to seal the threads
     

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