Oil PSI light, H20 temp light?

Big Block A body Tech

  1. Cope

    Cope Fusing with fire

    Messages:
    2,436
    Likes Received:
    1816
    Joined:
    Oct 20, 2009
    Location:
    San Jose, Ca.
    Local Time:
    9:22 PM
    Im thinking about adding a oil psi light and just looking at kits and such it look like i can just about buy any pressure sending unit and T it off my gauge.

    my guestion is would the single wire on the sending unit be ground? and hot to the light?

    Thanks.
     
  2. 4spdragtop

    4spdragtop FABO Gold Member FABO Gold Member

    Messages:
    24,952
    Likes Received:
    4261
    Joined:
    Aug 28, 2009
    Location:
    Ontario
    Local Time:
    9:22 PM
    Are you trying to add an " idiot light" or trying to light up a gauge?
     
  3. Cope

    Cope Fusing with fire

    Messages:
    2,436
    Likes Received:
    1816
    Joined:
    Oct 20, 2009
    Location:
    San Jose, Ca.
    Local Time:
    9:22 PM
    I have an autometer gauge but I want an idiot light also just incase..

    what PSI would be considered low?

    also i want a temp light, H20 temp idiot light should the light come on, 220? I run around 190 in traffc.

    Thanks.
     
    Last edited: Aug 10, 2016
  4. 4spdragtop

    4spdragtop FABO Gold Member FABO Gold Member

    Messages:
    24,952
    Likes Received:
    4261
    Joined:
    Aug 28, 2009
    Location:
    Ontario
    Local Time:
    9:22 PM
    I believe the sender is self grounding. So only one wire. Im not sure if they can both function from the same sender??
    I have an autometer as well but its mech style.
    I would think min 25 psi and yer good. Dads never gets below 40
     
  5. Cope

    Cope Fusing with fire

    Messages:
    2,436
    Likes Received:
    1816
    Joined:
    Oct 20, 2009
    Location:
    San Jose, Ca.
    Local Time:
    9:22 PM
    yes the sender is grounded but the sender is not a hot wire? correct?

    so hot wire to light, ground to sender?

    my.plan is to run dual sending units, one for the light and one for the gauge.
     
  6. 4spdragtop

    4spdragtop FABO Gold Member FABO Gold Member

    Messages:
    24,952
    Likes Received:
    4261
    Joined:
    Aug 28, 2009
    Location:
    Ontario
    Local Time:
    9:22 PM
    Run coolant water at 50/50 and 220 should be ok.
    I have autometer water temp and oil psi aftermarket mounted on lower edge of dash. we left factory gauges in dash as we like stock look. The gauges worked but they are still almost 50 years old.
     
  7. 4spdragtop

    4spdragtop FABO Gold Member FABO Gold Member

    Messages:
    24,952
    Likes Received:
    4261
    Joined:
    Aug 28, 2009
    Location:
    Ontario
    Local Time:
    9:22 PM
    For me the coolant sensor has only one wire to it. I cant remember how many wires go to gauges.
    Chk autometer website out for the wiring?
     
  8. RustyRatRod

    RustyRatRod 30 Degrees Outta Whack FABO Gold Member

    Messages:
    47,992
    Likes Received:
    13369
    Joined:
    Jun 7, 2010
    Location:
    Georgia
    Local Time:
    10:22 PM
    Run hot to the light on one side and the switch to the other side from ground, yes. The PSI ranges from 3-7 to cut the light on.
     
  9. Cope

    Cope Fusing with fire

    Messages:
    2,436
    Likes Received:
    1816
    Joined:
    Oct 20, 2009
    Location:
    San Jose, Ca.
    Local Time:
    9:22 PM
    ok so who makes a sending unit that trips/opens at 3/7 PSI?

    and 220 degrees is ok for H20 temp?
    shit what is to hot, i get worried around 210....
     
  10. RustyRatRod

    RustyRatRod 30 Degrees Outta Whack FABO Gold Member

    Messages:
    47,992
    Likes Received:
    13369
    Joined:
    Jun 7, 2010
    Location:
    Georgia
    Local Time:
    10:22 PM
  11. Cope

    Cope Fusing with fire

    Messages:
    2,436
    Likes Received:
    1816
    Joined:
    Oct 20, 2009
    Location:
    San Jose, Ca.
    Local Time:
    9:22 PM
    Ok, ok..
    Thats what i thought. any generic sending unit and a raidio shack 12v light should work.

    what about H20 temp sendimg unit?
     
  12. 4spdragtop

    4spdragtop FABO Gold Member FABO Gold Member

    Messages:
    24,952
    Likes Received:
    4261
    Joined:
    Aug 28, 2009
    Location:
    Ontario
    Local Time:
    9:22 PM
    Straight water boils at 212* Chk coolant jug to see what 50/50 boils at.Different coolants may vary
     
  13. Cope

    Cope Fusing with fire

    Messages:
    2,436
    Likes Received:
    1816
    Joined:
    Oct 20, 2009
    Location:
    San Jose, Ca.
    Local Time:
    9:22 PM
    i run a small amount of antifreeze and water weter. so 210 is to hot?
     
  14. Jlcaptain24

    Jlcaptain24 Well-Known Member

    Messages:
    473
    Likes Received:
    126
    Joined:
    Apr 21, 2012
    Location:
    Fort Worth
    Local Time:
    9:22 PM
    I did the same thing for my dart....guage plus lights.
    Here's the sender I used:Oil Pressure Switch - W/ Light-440 Source

    I used little LED flush mount bolt lights from here: Flush Mount LED Bolt | Oznium They're bright at shit, so wired in a 3Kohm resister inline with them which reduced them perfectly. Flush, clean little lights. Above poster is correct....the sender is self grounding.
     
  15. halifaxhops

    halifaxhops It's going to get stupid around here! FABO Gold Member

    Messages:
    47,966
    Likes Received:
    16089
    Joined:
    Jan 20, 2014
    Location:
    CENTRURAL, PA
    Local Time:
    10:22 PM
    You can get a temp switch at just about any range you want.
     
  16. RustyRatRod

    RustyRatRod 30 Degrees Outta Whack FABO Gold Member

    Messages:
    47,992
    Likes Received:
    13369
    Joined:
    Jun 7, 2010
    Location:
    Georgia
    Local Time:
    10:22 PM
    No 210 is not too hot. Not even for plain water. Rememper the system is under pressure.
     
  17. TrailBeast

    TrailBeast Slightly Twisted Member

    Messages:
    19,224
    Likes Received:
    5566
    Joined:
    Mar 11, 2011
    Location:
    Arizona
    Local Time:
    8:22 PM
    You can also get adjustable switches and set it for whatever pressures you want it to come on at.
    And yes, keyed power to the light and the sender grounds it when the pressure is too low.
    Basically what happens is the light would come on when you turn the key on and then go off when your oil pressure came up.

    Just an FYI, you can do exactly the same thing with buzzers for an audio warning.
    One of my cars had all three (gauge, idiot light and a buzzer) for oil pressure, temp, and charging system.
    I had a switch that you could turn the buzzers off or on with if you didn't want audio and just gauges with idiot lights.

    Not to long ago on here we discussed how to make the gauges and speedometer backlighting all turn red instead of an idiot light.
    That was pretty cool also.
     
  18. 67Dart273

    67Dart273 Well-Known Member

    Messages:
    38,642
    Likes Received:
    6247
    Joined:
    Oct 14, 2010
    Location:
    Idaho
    Local Time:
    7:22 PM
    Also, if you are crafty, you can use something like your brake light for the temp warning. "You just have to remember". The brake light is already all hooked up. Just tie into the brake switch wire and run it over to the temp or sender.

    However, remember you must actually get the correct sender. They MUST be for a lamp and not a gauge.

    GM or Ford, can't remember, did this "awhile back," remember? They had an "engine warning lamp" It was branched off to BOTH the temp an oil, one light did two jobs.
     
  19. TrailBeast

    TrailBeast Slightly Twisted Member

    Messages:
    19,224
    Likes Received:
    5566
    Joined:
    Mar 11, 2011
    Location:
    Arizona
    Local Time:
    8:22 PM
    Yep, lights use and on/off type sender switch and gauges use a variable voltage rheostat type sender.

    Heck you could even make something that yelled "AAAAAHHHHH, NO OIL PRESSURE!" :D
    It' all just control switches and something that reacts when switched.
     
  20. halifaxhops

    halifaxhops It's going to get stupid around here! FABO Gold Member

    Messages:
    47,966
    Likes Received:
    16089
    Joined:
    Jan 20, 2014
    Location:
    CENTRURAL, PA
    Local Time:
    10:22 PM
  21. hangn0ut

    hangn0ut Well-Known Member

    Messages:
    741
    Likes Received:
    116
    Joined:
    Dec 3, 2012
    Location:
    rialto.ca.
    Local Time:
    7:22 PM
    Pressure switch? Hobbs. Temp should be at the lowest abnormal temp for that engine. If it never hits 200° set it for 200 not 210 or 220. If the light comes on ocasionally during normal use,thats okay cause it tells you to keep watch on it. Thats my opinion.
     
  22. AJ/FormS

    AJ/FormS The end is near FABO Gold Member

    Messages:
    15,005
    Likes Received:
    4149
    Joined:
    Jan 19, 2014
    Location:
    South-Central Manitoba,Canada, 900ftelevation
    Local Time:
    9:22 PM
    And the big caveat; gauges and lights only work if you are looking at them. If your eyes are on them, who is driving? I like to drive, so no gauges here....... Well, I have; a speed-O, and a tach.
    Once in a while I look at the tach.....
    But the Speed-O is my friend. It saves me buckets of money.
     
  1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.