Oil Pressure Switch question.

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  • BeirBrennerE30
    R3VLimited
    • Oct 2003
    • 2740
    #1

    Oil Pressure Switch question.

    I am attempting to bench test some custom gauges, Oil pressure and Oil temp. I have a seonsor here that is half oil pressure sensor and oil pressure switch so I should have to be able to keep the idiot light while having a gauge without using a distrobution block.

    So my qustion is what signal or voltage is in the oil pressure switch wire? Im away from my car at the moment so i cant really test it for myself sorry.

    I am assuming that it is just a ref. voltage that is looking for the switch to click over to ground when the pressure is too low. I really dont want to smoke the sensor so what voltage am i lookin for?

    Here are the gauges for those who missed the thred...
    e30sport.net
    '86 325es - s54b32tu - 6-speed - Mtech 1
    '89 325is - m20b25 - 5-speed - Individual​
    '06 M3 Competition - 6-speed
    '19 Porsche GT3 RS - 7-speed PDK
    '94 Lancia Delta HF Integrale EvoII - Giallo Ginestra
    '97 Range Rover Vitesse
    Tags: None
    • DaveSmed
      E30 Fanatic
      • Apr 2007
      • 1406
      #2
      Simplest circuit evar. You will have 12v at the switch with the key on. All it is, is one side of a bulb with switched +12v, and the other side grounds through the switch itself.

      (12v=w.e. batt voltage is, should you care to be precise)
      -Dave
      2003 Lincoln Towncar | 1992 BMW 325iC | 1968 Cadillac Deville

      Need some help figuring out the ETM?

        Comment

        • BeirBrennerE30
          R3VLimited
          • Oct 2003
          • 2740
          #3
          Originally posted by DaveSmed
          Simplest circuit evar. You will have 12v at the switch with the key on. All it is, is one side of a bulb with switched +12v, and the other side grounds through the switch itself.

          (12v=w.e. batt voltage is, should you care to be precise)

          great... thats what I was hoping for. I just didnt know if the voltage was somehow stepped down.
          e30sport.net
          '86 325es - s54b32tu - 6-speed - Mtech 1
          '89 325is - m20b25 - 5-speed - Individual​
          '06 M3 Competition - 6-speed
          '19 Porsche GT3 RS - 7-speed PDK
          '94 Lancia Delta HF Integrale EvoII - Giallo Ginestra
          '97 Range Rover Vitesse

            Comment

            • chivas
              Advanced Member
              • Sep 2006
              • 119
              #4
              where did you get that gauge cluster from?

                Comment

                • george graves
                  I waste 90% of my day here and all I got was this stupid title
                  • Oct 2003
                  • 19986
                  #5
                  From what I know - a guy in Germany that only made a few. ~$500
                  Originally posted by Matt-B
                  hey does anyone know anyone who gets upset and makes electronics?

                    Comment

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