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Thread: 1989 silverado 5.7 to 5.3 swap-oil pressure and water temp questions

  1. #1
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    May 2013
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    1989 silverado 5.7 to 5.3 swap-oil pressure and water temp questions

    ok guys so i started to cut wire from the passenger side harness that goes to the computer. when i pulled the old motor i forgot to mark and take off the old sensors for my guages. now im have trouble locating them for when i go to hook everthing up with the new motor. i need help identifing the plugs/wires that go to the temp sensor and the oil press sensor. i have done multiple searches for diagrams and other info that i need but nothing that matches up to what i need. thanks in advance guys

  2. #2
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    May 2013
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    as far as i remember from what i read, the wires coming out of the driverside harness is where these wires are located and on a side note when i went to orilies to get the oil and temp sensors, they had two different oil sensors, one with a 3 pin and one with a 2 pin, all i can find in my wires are mainly 1 pin connectors out of the passenger side harness
    Last edited by omar2guy; 09-12-2013 at 11:30 AM.

  3. #3
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    Anyone!!!!

  4. #4
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    These are the only two I can think of it bieng and I'm leaning towards the more round one, can anyone help?

  5. #5
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    From the instrument panel cluster, locate the green wire at position "R" of the cluster plug. This wire goes to the temperature sensor.
    From the instrument panel cluster, locate the tan wire at position "P" of the cluster plug. This wire goes to the oil pressure sensor.

    Not sure if these wires come from the driver's side firewall or the passenger side. You will have to track them down working from the cluster panel plug towards the firewall.
    Judging by these schematics, your sensors should be one wire sensors.






    Here's a copy of the diagrams:

    http://arrc.ebscohost.com/statics/p5.../91026w01l.jpg

    http://arrc.ebscohost.com/statics/p5.../91026w02l.jpg
    Last edited by Mickeymotormount; 09-13-2013 at 03:34 PM.
    '93 Chevy 1500 4X4 ECLB with a '99 Silverado LQ4 6.0 and '99 Escalade 4L60E. SOLD IT!!

    New toy: 2001 2500 HD 4X4 Extended Cab Long Bed


    John

  6. #6
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    May 2013
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    Damn bro u did it lol I'm so thankfull appreciate it

  7. #7
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    So then the sensors r gona be different then what they are telling me if they are just single wires, so then do I just get some single wire sending units?

  8. #8
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    Sep 2012
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    Quakertown, Pa.
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    Yes. They will need adapters though to fit the LS engine's metric threaded ports.

    You can also hit the junk yard and check out trucks similar to your year that are unmolested. This way, you can see which wires are what and how the sensors look.
    '93 Chevy 1500 4X4 ECLB with a '99 Silverado LQ4 6.0 and '99 Escalade 4L60E. SOLD IT!!

    New toy: 2001 2500 HD 4X4 Extended Cab Long Bed


    John

  9. #9
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    May 2013
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    Yea....thanks for your help bud

  10. #10
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    warwick ny
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    The black connector is your temp sensor 99% sure.

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