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360 Oil Pressure unit only one wire

Discussion in '360/430' started by 550nitis, Nov 3, 2019.

  1. 550nitis

    550nitis Formula Junior

    Feb 3, 2016
    318
    Los Angeles, CA
    Noticed my oil pressure unit only has one wire going into it, the readings aren't crazy but erratic at times.I am also not seeing an additional wire that should go into it hanging around. Does anyone have a picture of their 360 oil pressure sender unit they could take a picture of?
     
  2. RossoC360

    RossoC360 Formula Junior
    Rossa Subscribed Owner

    Jun 20, 2008
    375
    Buffalo NY
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    Jason
    I don't have a picture, but there should only be one wire on there, that is correct.
     
  3. wbt

    wbt Karting

    Nov 28, 2014
    133
    New Zealand
    One wire, to terminal labelled "G" on the sensor. The sensor part is used across a lot of models and some older cars use 2 wires but ours are smart enough to only need one (the second terminal illuminates the low pressure oil light on the dash in older non-digital dash cars).

    The cause of the erratic gauge is usually the sensor failing. It's easily replaced if you take the oil filter off - either buy the Ferrari part or there's a few threads on here detailing an aftermarket part and a thread adaptor.
     
  4. RedNeck

    RedNeck F1 Veteran
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    Jul 8, 2016
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    There will only be 1 wire, and a picture may not tell you much as 2 the 2 terminals have 2 different functions-signal and ground. The ground terminal is common to the body of the sender, and when screwed into the housing, is grounded there, so it does not need anything connected to it. The best way to differentiate is to grab a meter and measure the resistance between the body and the terminal. 1 will have almost NO resistance, this is the ground, that will not need connected. The other will have some, and I don't remember the actual number right now, but that is your signal.

    It's not necessary to remove the oil filter, you can get to it just fine using a 24mm thin bike wrench...
     
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  5. wbt

    wbt Karting

    Nov 28, 2014
    133
    New Zealand
    It's not quite a ground terminal, rather it's a switch to ground that closes at low oil pressure. When the car fires up the terminal goes open circuit under normal oil pressure conditions. When removed from the car it will also appear as if it is connected to the body of the sensor, but it's actually a switch.

    To be clear for everyone with a 355/360 follow the markings on the oil pressure sensor as below:
    Terminal labeled "G" - connects to the signal wire. (Resistance will measure between 10-180 ohms depending on oil pressure).
    Terminal labeled "WK" - warning light switch, left unconnected. (When pressure is bigger than 11psi, the WK switch will be open; When pressure is smaller than 11psi, the WK switch will be closed or connected to ground.)
     
  6. mello

    mello F1 Rookie
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    Jul 12, 2013
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    Steve
    I read awhile back that there is a silicon sock available to protect the sensor from the engine heat. Any idea as to where I can get one?
     
  7. wbt

    wbt Karting

    Nov 28, 2014
    133
    New Zealand
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    Ricambi America F1 World Champ
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  9. RedNeck

    RedNeck F1 Veteran
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    Jul 8, 2016
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    That makes sense..thanks for the clarification.

    Yes, Ricambi. I used one when I replaced my sensor a year or 2 ago...
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  10. mello

    mello F1 Rookie
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    My sensor is a VDO with the adapter, not the OEM Ferrari unit. Would the sock fit?
     
  11. RedNeck

    RedNeck F1 Veteran
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    Jul 8, 2016
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    Yeah, the body of the sender is the same. It is a tight fit though...
     
  12. mello

    mello F1 Rookie
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    Jul 12, 2013
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    Thanks to everyone. I'll give it a try.
     
  13. 550nitis

    550nitis Formula Junior

    Feb 3, 2016
    318
    Los Angeles, CA
    Is there any difference in using the VDO with the adaptor or the OEM Ferrari part?
     
  14. wbt

    wbt Karting

    Nov 28, 2014
    133
    New Zealand
    No, so long as you get the correct VDO gauge with 10-180 ohm output.
     

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