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Thread: Wiring Harness question for LS-1 swap into 95 Silverado

  1. #1
    Join Date
    Feb 2009
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    Conway
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    Wiring Harness question for LS-1 swap into 95 Silverado

    I've read lot's of post and can't seem to find the answer to the below question. This is my first LS-1 swap and I have a lot to learn.

    I have a 2002 Firebird LS-1 4L60E combo with a computer. I plan to use my factory gages. How much of the factory harness and computer can I remove.

    Any information, diagrams or pics would be greatly appreciated.

    Thanks

  2. #2
    Join Date
    Sep 2007
    Location
    Hutto TX
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    467
    All of the factory wiring and computer can be thrown in the garbage....perhaps. Speed/tach should be no problem coming off the new PCM. Oil pressure/fuel/volts/temp come from the senders, but the temp thing gets tricky. I used a 3 wire from a Camaro i think, and its pretty far off. Some people say to do swappy things with oil pressure, but i used the 5.3 one and my gauge works?? You should be able to have all your truck stuff work with either computer. Should you keep your ABS computer? I dunno....

    I'm not 100% familiar with what other 95ers kept and tossed..Jon?
    1991 Silverado ECLB
    LM7-T56

  3. #3
    Join Date
    Oct 2003
    Posts
    473
    The water temperature gauge works perfect by simply using a 4.3 V-6 sender, placed at the right rear cylinder head, via an adapter(from S & P), because its just an anolog gauge/sender set-up. At least it did for me in my '96.

  4. #4
    Join Date
    Dec 2004
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    San Antonio, TX Area
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    1,741
    Quote Originally Posted by r6z4o6 View Post
    I used a 3 wire from a Camaro i think, and its pretty far off.
    I was also told not to use the 98 sensor, because it was way off.
    "ALisSa1 Silverado"
    1990 Chevrolet RCSB 2002 Chevrolet Camaro LS1/4L60E
    Scrimpin Ain't Easy
    ( . Y . )


  5. #5
    Join Date
    Aug 2004
    Location
    Magnolia, TX
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    3,259
    go Coastal Carolina....nothing for the post though

  6. #6
    Join Date
    Oct 2003
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    473
    Quote Originally Posted by trsmith View Post
    I've read lot's of post and can't seem to find the answer to the below question. This is my first LS-1 swap and I have a lot to learn.

    I have a 2002 Firebird LS-1 4L60E combo with a computer. I plan to use my factory gages. How much of the factory harness and computer can I remove.

    Any information, diagrams or pics would be greatly appreciated.

    Thanks
    How is your swap coming along?

  7. #7
    Join Date
    Nov 2007
    Location
    Spiro, Oklahoma
    Posts
    316
    Quote Originally Posted by Chevy-Art View Post
    I was also told not to use the 98 sensor, because it was way off.
    I used the three wire sensor and it seems to read about where it should, usually reads right around the first 1/4 mark same as the old 5.7 did.
    1991 Silverado-L33 5.3L, 212/218 .557 .562 115+4, ASP under drive pulley,180* thermostat, 90mm truck intake w/ LS3 throttle body. Shoenfeld conversion headers and duel Flowmaster exhaust. Performabuilt LVL 1 transmission and 23-2500 stall converter.

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